implementation for setting the transition timewindow length

contracts/base/StakingHbbftBase.sol

@@ -451,6 +451,14 @@ contract StakingHbbftBase is Initializable, OwnableUpgradeable, IStakingHbbft {
         _removePool(stakingAddress);
     }
 
+    function setStakingTransitionTimeframeLength(uint256 _value) 
+        external
+        onlyOwner {
+        require(_value > 10, "The transition timeframe must be longer than 10");
+        require(_value < stakingFixedEpochDuration, "The transition timeframe must be smaller than the epoch duration");
+
+        stakingTransitionTimeframeLength = _value;
+    }
     /// @dev Sets the timetamp of the current epoch's last block as the start time of the upcoming staking epoch.
     /// Called by the `ValidatorSetHbbft.newValidatorSet` function at the last block of a staking epoch.
     /// @param _timestamp The starting time of the very first block in the upcoming staking epoch.

scripts/upgrade_contracts2.ts

@@ -0,0 +1,21 @@
+import { ethers, upgrades } from "hardhat";
+
+
+async function upgrade() {
+
+    const [deployer] = await ethers.getSigners();
+
+    console.log("upgrading with account from: ", deployer.address);
+
+    let stakingContract = await ethers.getContractAt("StakingHbbft", "0x1100000000000000000000000000000000000001");
+
+    let txResult = await stakingContract.setStakingTransitionTimeframeLength(300);
+
+    console.log("Done.", txResult);
+}
+
+
+upgrade().catch((error) => {
+    console.error(error);
+    process.exitCode = 1;
+});