diff --git a/estore/src/app/admin/page.tsx b/estore/src/app/admin/page.tsx
index 75859d6..e04a1f6 100644
--- a/estore/src/app/admin/page.tsx
+++ b/estore/src/app/admin/page.tsx
@@ -281,6 +281,26 @@ function HoursEditor() {
         </div>
       ))}
 
+      <div style={{ marginBottom: '1.5rem' }}>
+        <label style={{ fontWeight: 600, fontSize: '0.85rem', display: 'block', marginBottom: '0.4rem' }}>
+          Delivery arrival window (minutes)
+        </label>
+        <p style={{ fontSize: '0.78rem', color: '#888', marginBottom: '0.5rem' }}>
+          How long the customer&apos;s arrival window is — shown on their confirmation email and sent to Square.
+        </p>
+        <input
+          type="number"
+          className="input is-small"
+          min={15}
+          max={480}
+          step={15}
+          value={config.deliveryWindowMinutes ?? 60}
+          onChange={(e) => setConfig((prev) => prev ? { ...prev, deliveryWindowMinutes: Math.max(15, parseInt(e.target.value) || 60) } : prev)}
+          style={{ width: 100 }}
+        />
+        <span style={{ marginLeft: 8, fontSize: '0.82rem', color: '#666' }}>min</span>
+      </div>
+
       <div style={{ display: 'flex', alignItems: 'center', gap: 12 }}>
         <button
           className={`button is-dark is-small${saving ? ' is-loading' : ''}`}
diff --git a/estore/src/app/api/checkout/route.ts b/estore/src/app/api/checkout/route.ts
index 2e8856a..1664ec5 100644
--- a/estore/src/app/api/checkout/route.ts
+++ b/estore/src/app/api/checkout/route.ts
@@ -1,6 +1,7 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { createHash } from 'crypto'
 import { inferTier, JOB_MINUTES, type DeliveryTier } from '@/lib/delivery'
+import { getHoursConfig } from '@/lib/hours'
 
 interface LineItem {
   name:           string
@@ -98,11 +99,12 @@ export async function POST(req: NextRequest) {
       ? deliveryTier
       : inferTier(lineItems.map((l) => l.name))
 
-  const arrivalISO = deliverySlotISO
-  const jobMin     = JOB_MINUTES[resolvedTier]
-  const windowDurationStr = deliverySlotISO
-    ? `PT${Math.floor(jobMin / 60) > 0 ? `${Math.floor(jobMin / 60)}H` : ''}${jobMin % 60 > 0 ? `${jobMin % 60}M` : ''}`
-    : undefined
+  const arrivalISO          = deliverySlotISO
+  const jobMin              = JOB_MINUTES[resolvedTier]  // calendar event duration (internal)
+  const windowMin           = getHoursConfig().deliveryWindowMinutes  // customer-facing window
+  const toIsoDuration = (m: number) =>
+    `PT${Math.floor(m / 60) > 0 ? `${Math.floor(m / 60)}H` : ''}${m % 60 > 0 ? `${m % 60}M` : ''}`
+  const windowDurationStr   = deliverySlotISO ? toIsoDuration(windowMin) : undefined
 
   const fmtSlot = (iso: string) =>
     new Date(iso).toLocaleString('en-US', { timeZone: 'America/New_York', dateStyle: 'medium', timeStyle: 'short' })
@@ -386,10 +388,9 @@ export async function POST(req: NextRequest) {
     if (!captured) throw new Error('Payment capture returned no result')
 
     // ── Fire-and-forget: emails only (calendar already written above) ────────
-    const subtotalCents      = lineItems.reduce((sum, li) => sum + li.priceCents * li.quantity, 0)
-    const CUSTOMER_WINDOW_MIN = 60  // 1-hour arrival window shown to customer
+    const subtotalCents = lineItems.reduce((sum, li) => sum + li.priceCents * li.quantity, 0)
     const slotEndISO    = deliverySlotISO
-      ? new Date(new Date(deliverySlotISO).getTime() + CUSTOMER_WINDOW_MIN * 60_000).toISOString()
+      ? new Date(new Date(deliverySlotISO).getTime() + windowMin * 60_000).toISOString()
       : undefined
 
     void (async () => {
diff --git a/estore/src/lib/caldav.ts b/estore/src/lib/caldav.ts
index 362f9be..d2d777f 100644
--- a/estore/src/lib/caldav.ts
+++ b/estore/src/lib/caldav.ts
@@ -108,8 +108,8 @@ function buildItemLines(lineItems: CalendarLineItem[]): string {
     if (li.modifiers?.length) parts.push(`  ${li.modifiers.map((m) => m.name).join(', ')}`)
     if (li.colors?.length)    parts.push(`  Colors: ${li.colors.join(', ')}`)
     if (li.note)              parts.push(`  Note: ${li.note}`)
-    return parts.join('\\n')
-  }).join('\\n')
+    return parts.join('\n')
+  }).join('\n')
 }
 
 export async function createDeliveryEvent(params: {
@@ -143,7 +143,7 @@ export async function createDeliveryEvent(params: {
     '',
     `Order: ${orderId}`,
     `Drive: ~${driveMinutes} min each way`,
-  ].filter((p) => p !== null).join('\\n')
+  ].filter((p) => p !== null).join('\n')
 
   const ical = [
     'BEGIN:VCALENDAR',
@@ -204,7 +204,7 @@ export async function createPickupEvent(params: {
     notes ? `Notes: ${notes}` : null,
     '',
     `Order: ${orderId}`,
-  ].filter((p) => p !== null).join('\\n')
+  ].filter((p) => p !== null).join('\n')
 
   const ical = [
     'BEGIN:VCALENDAR',
diff --git a/estore/src/lib/hours-config.ts b/estore/src/lib/hours-config.ts
index 91b190d..4a4319a 100644
--- a/estore/src/lib/hours-config.ts
+++ b/estore/src/lib/hours-config.ts
@@ -8,11 +8,13 @@ export interface DayHours {
 export type WeekHours = Record<string, DayHours | null>   // keys '0'–'6'
 
 export interface HoursConfig {
-  delivery: WeekHours
-  pickup:   WeekHours
+  delivery:              WeekHours
+  pickup:                WeekHours
+  deliveryWindowMinutes: number   // customer-facing arrival window (email + Square)
 }
 
 export const DEFAULT_HOURS: HoursConfig = {
+  deliveryWindowMinutes: 60,
   delivery: {
     '0': { open:  480, close: 1020 },  // Sun  8:00 AM –  5:00 PM
     '1': null,                          // Mon  closed
diff --git a/estore/src/lib/hours.ts b/estore/src/lib/hours.ts
index d5efcae..280c211 100644
--- a/estore/src/lib/hours.ts
+++ b/estore/src/lib/hours.ts
@@ -14,8 +14,9 @@ export function getHoursConfig(): HoursConfig {
   try {
     const saved = JSON.parse(readFileSync(HOURS_PATH, 'utf-8')) as Partial<HoursConfig>
     return {
-      delivery: { ...DEFAULT_HOURS.delivery, ...(saved.delivery ?? {}) },
-      pickup:   { ...DEFAULT_HOURS.pickup,   ...(saved.pickup   ?? {}) },
+      delivery:              { ...DEFAULT_HOURS.delivery, ...(saved.delivery ?? {}) },
+      pickup:                { ...DEFAULT_HOURS.pickup,   ...(saved.pickup   ?? {}) },
+      deliveryWindowMinutes: saved.deliveryWindowMinutes ?? DEFAULT_HOURS.deliveryWindowMinutes,
     }
   } catch {
     return DEFAULT_HOURS