diff --git a/crates/aldabra-dao/src/builder/proposal_create.rs b/crates/aldabra-dao/src/builder/proposal_create.rs
index 3a5ebe0..4af700b 100644
--- a/crates/aldabra-dao/src/builder/proposal_create.rs
+++ b/crates/aldabra-dao/src/builder/proposal_create.rs
@@ -574,8 +574,16 @@ pub fn build_unsigned_proposal_create(
     // pauthorizedBy on the stake checks proposer's pkh appears in
     // txInfoSignatories — we disclose it explicitly so pallas-txbuilder
     // knows to require + emit the corresponding witness.
+    // Range width must be ≤ governor.create_proposal_time_range_max_width
+    // (in ms; slot length on every Shelley+ network is 1 second). For
+    // Sulkta-shape governors with 30min windows, the legacy 1799-slot
+    // const fits. For tiny test DAOs (preprod_test: 30s) it must shrink
+    // to the per-DAO budget. Subtract 1 slot for safety against round-up.
+    let max_width_slots = ((args.governor.datum.create_proposal_time_range_max_width / 1_000) as u64)
+        .saturating_sub(1)
+        .min(VALIDITY_RANGE_SLOTS);
     staging = staging.valid_from_slot(args.tip_slot);
-    staging = staging.invalid_from_slot(args.tip_slot + VALIDITY_RANGE_SLOTS);
+    staging = staging.invalid_from_slot(args.tip_slot + max_width_slots);
 
     let proposer_pkh_arr: [u8; 28] = args
         .proposer_pkh