diff --git a/app/features/calendar/calendar-constants.ts b/app/features/calendar/calendar-constants.ts
index ac430c95e..dbcbdd894 100644
--- a/app/features/calendar/calendar-constants.ts
+++ b/app/features/calendar/calendar-constants.ts
@@ -93,6 +93,7 @@ export const REG_CLOSES_AT_OPTIONS = [
 	"3h",
 	"6h",
 	"12h",
+	"18h",
 	"24h",
 	"48h",
 	"72h",
diff --git a/app/features/calendar/calendar-utils.ts b/app/features/calendar/calendar-utils.ts
index b76cd0232..88224c4ab 100644
--- a/app/features/calendar/calendar-utils.ts
+++ b/app/features/calendar/calendar-utils.ts
@@ -43,6 +43,8 @@ export function regClosesAtDate({
 			return new Date(startTime.getTime() - 360 * 60 * 1000);
 		case "12h":
 			return new Date(startTime.getTime() - 720 * 60 * 1000);
+		case "18h":
+			return new Date(startTime.getTime() - 1080 * 60 * 1000);
 		case "24h":
 			return new Date(startTime.getTime() - 1440 * 60 * 1000);
 		case "48h":
@@ -78,6 +80,8 @@ export function regClosesAtToDisplayName(closesAt: RegClosesAtOption) {
 			return "6 hours";
 		case "12h":
 			return "12 hours";
+		case "18h":
+			return "18 hours";
 		case "24h":
 			return "24 hours";
 		case "48h":
@@ -108,6 +112,7 @@ export function datesToRegClosesAt({
 	if (diff === 180 * 60 * 1000) return "3h";
 	if (diff === 360 * 60 * 1000) return "6h";
 	if (diff === 720 * 60 * 1000) return "12h";
+	if (diff === 1080 * 60 * 1000) return "18h";
 	if (diff === 1440 * 60 * 1000) return "24h";
 	if (diff === 2880 * 60 * 1000) return "48h";
 	if (diff === 4320 * 60 * 1000) return "72h";