My suggestions (not rules or demands, just suggestions) :

1. Try to describe your actions in a post of 40 - 50 rows (no one will kill you if you write more rows, but that will encumber the RP)

2. If the secondary significance things (not the character's main actions) are rather long, for example long descriptions of dreams or long descriptions of wandering in a maze etc.
put them in a hider (like we do with the character summary) and only summarize the consequences of them in the not hidden part.

3. The first rule applies only to things that are not covered by the second rule (together with the stuff inside the hiders, the post can exceed the 40-50 rows limitation),
the important thing is that the actions and main important things that have to do with the post are quickly readable and understandable. So people that have a limited time can still participate and enjoy the RP.

4. If your post doesn't exceed 30-40 rows, you don't have to use hiders.