Since the increase on timers it became absurdly hard to get to T3, not because of the difficulty but it just takes too much time. You will losse all your progress if the cycle changes and will have to start from a T1 vault again. The average time i'm getting from (trying) to do 3 vaults are 40 minutes, cycles are every 60 minutes. This means i'll have 10 minutes to start a vault run or else i'll be unable to get to the T3 vault. The time must be reduced so people can actually get to the Tier 3 Vault or if this option is just incapable of being applied, increase each cycle time to 2 or 3 hours,