Norms for checking on the status of conditional acceptances?

In our April "how can we help you?" thread, a reader asks:

Are the norms for emailing an editor to inquire about a submission's status any different for minor revisions/conditional acceptances than they are for initial submissions? Is it appropriate to email after just three months, say, if you still haven't heard back about a conditional acceptance?

I would think the norms are the same as for any submission. If three months have passed, you can always write to check on the status. But these are just my thoughts. 

What are yours?