AoW reduced thrall conversion time down to 15 minutes per tier of thrall.
That’s 1 hour for a T4.
But taskmasters still do their thing too. A T4 taskmaster increases crafting time by 150%, bringing an hour down to 24 minutes.
But even that wasn’t good enough. The booster event halves conversion time on official servers, allowing a T4 thrall to be converted in 12 minutes.
It is absolutely ridiculous, in my opinion.