In a build log, you post what and when you feel like for use to see and follow.
If you want to do multiple steps, each posting has the ability to accept 25 photos I think is the limit.
No limits on number of back to back postings, so you can do one step per post and then add next post for next step.
Like we say on the actual ship build when a descision has to be made on an issue, its your ship you decide.