diff --git a/src/__tests__/plan.test.ts b/src/__tests__/plan.test.ts
index 72c4ab0..66b2a5e 100644
--- a/src/__tests__/plan.test.ts
+++ b/src/__tests__/plan.test.ts
@@ -909,6 +909,20 @@ describe("plan.service.bulkCreateEntries", () => {
     );
     expect("error" in empty && empty.status).toBe(400);
 
+    const tooLong = await bulkCreateEntries(
+      {
+        user_ids: [adminUserId],
+        date_from: "2096-01-01",
+        date_to: "2096-12-31", // > 92 days
+        include_weekends: true,
+        project_id: null,
+        category: "work",
+        note: `${N}x`,
+      },
+      adminUserId,
+    );
+    expect("error" in tooLong && tooLong.status).toBe(400);
+
     const past = await bulkCreateEntries(
       {
         user_ids: [adminUserId],
diff --git a/src/schemas/plan.schema.ts b/src/schemas/plan.schema.ts
index 600655a..8f6239a 100644
--- a/src/schemas/plan.schema.ts
+++ b/src/schemas/plan.schema.ts
@@ -88,7 +88,8 @@ export const BulkPlanEntrySchema = z
   .object({
     user_ids: z
       .array(intFromForm)
-      .min(1, "Vyberte alespoň jednoho zaměstnance"),
+      .min(1, "Vyberte alespoň jednoho zaměstnance")
+      .transform((ids) => [...new Set(ids)]),
     date_from: isoDate,
     date_to: isoDate,
     include_weekends: z
diff --git a/src/services/plan.service.ts b/src/services/plan.service.ts
index 2d7b21d..29fc426 100644
--- a/src/services/plan.service.ts
+++ b/src/services/plan.service.ts
@@ -811,6 +811,13 @@ export async function bulkCreateEntries(
   const from = toDateOnly(input.date_from);
   const to = toDateOnly(input.date_to);
 
+  // Bound the work (users × days). Mirror the 92-day cap on GET /plan/grid so
+  // one bulk call can't fan out into thousands of inserts.
+  const rangeDays = Math.round((to.getTime() - from.getTime()) / 86400000) + 1;
+  if (rangeDays > 92) {
+    return { error: "Maximální rozsah je 92 dní", status: 400 };
+  }
+
   // The day list for the whole range (UTC midnights), built once.
   const days: Date[] = [];
   for (let d = new Date(from); d <= to; d.setUTCDate(d.getUTCDate() + 1)) {