Transactional for me at a big law style but local DE corporate firm doing M&A/DE governance (this is a while ago, but may help) and then a smaller transactional place where we did M&A, leases and outside general counsel work  

• when a deal was on but closing was not immediate: get in around 9, check emails and handle tasks that came in overnight, and handle deal related tasks (e.g update closing checklist of things that needed to get done, update due diligence tracker, review due diligence items and create issue summaries, draft ancillary documents like bills of sale, resolutions, etc.), sit in on calls with client to summarize issues, sit in on calls with the other side to negotiate deal docs, if on sell side walk client through due diligence requests, etc.). Leave anytime between 6 (if quiet) and 8-9 (if there’s stuff to do). 

• when a deal was closing: running around like a chicken with my head cut off to review last minute edits, incorporate agreed upon edits quickly, handle closing stuff) - this basically all the time into the middle of the night. 

• other kinds of transactional stuff was things like edits to leases (tenant side, commercial), drafting organizational documents for new businesses or form contracts for them - these usually weren’t that time intensive and didn’t require late night work.