      function testAirdropIssue() public {
        vm.warp(uint64(block.timestamp + 11));

        vm.prank(Alice, Alice);
        airdrop2.claim(Alice, 100, merkleProof);

        // Roll 5 days after
        vm.roll(block.number + 200);
        vm.warp(claimEnd + 5 days);

        airdrop2.withdraw(Alice);

        console.log("Alice balance:", token.balanceOf(Alice));

        // Roll 6 days after
        vm.roll(block.number + 200);
        vm.warp(claimEnd + 11 days);

        vm.expectRevert(ERC20Airdrop2.WITHDRAWALS_NOT_ONGOING.selector);
        airdrop2.withdraw(Alice);
    }
Logs:
  > MockERC20Airdrop @ 0x0000000000000000000000000000000000000000
    proxy      : 0xF62849F9A0B5Bf2913b396098F7c7019b51A820a
    impl       : 0x2e234DAe75C793f67A35089C9d99245E1C58470b
    owner      : 0x7FA9385bE102ac3EAc297483Dd6233D62b3e1496
    msg.sender : 0x1804c8AB1F12E6bbf3894d4083f33e07309d1f38
    this       : 0x7FA9385bE102ac3EAc297483Dd6233D62b3e1496
  Alice balance: 50
    uint256 constant bufferWindow = X mins/hours/days;

    modifier ongoingWithdrawals() {
        if (claimEnd > block.timestamp || claimEnd + withdrawalWindow < block.timestamp + bufferWindow) {
            revert WITHDRAWALS_NOT_ONGOING();
        }
        _;
    }
