Hello,
I recently did that to switch consulting companies from a Tier 2 to an MBB.
1) A few interviews during lunch break - I've told my manager that I had a personal thing that would take 2 hours
2) One interview set in the morning, from 8h to 9h30 - Same, I told the manager I had a thing
3) For advanced rounds, I took half a day vacation. I did it twice, even though I was on a project during one of the breaks. Managers usually trust the consultants if they are able to compensate and give the extra mile when needed. In my case, no questions were asked, but I am a senior consultant, and I am quite autonomous.
Hope it helps,
Good luck
(editiert)