Traditionally 12-18mos...

Mo 1-3 is new owners finding all the buried bodies, and restructuring leadership with people they can trust

3-6 mos is learning who is valuable and who is not (overlap with months 1-3)

6-9 mos is predicting how customers will react to X change or Y Change

9-12mos is final legal review of changes, exit packages, PR statements,etc (especially is mass layoffs are involved)

12-18mos is execution time frame for layoffs, and restructure of the organization

That's exactly the standard playbook. The acquisition happens, and there is a lot of talk sbout how important it is to keep everything the same, no one getting fired, no real changes except for a few different people to report to. Basically, no one gets fired in the first year while the new owners figure out what's actually going on with their purchase.

After the first year is when people get fired.

Just over a year, as the comments below guessed (congratulations! Prizes coming your way!).

Not many people got fired though, only a few managers (who to be fair, were a bit useless). Most others left "voluntarily" after the corp changes were made (you know, the ones that definitely weren't going to be made). It wasn't so bad though, we all got a good deal.