As GM, my general plan is one major post from the GM each day. Any additional posts are just informational. In combat, my general plan is one round a day. That way, assuming you have access to the internet at some point during the day, you will have the chance to respond before I make another major post. I want everyone to have the opportunity to participate.
So, for instance, examining posts, the post at midnight last night where the party encounters Del was a "Major post". The post at 8pm today where the party is standing at the entrance to the Moathouse is another "Major post". Everything else were just informational posts.
Also, its perfectly ok to make multiple responses in a post to things that happened sequentially. i.e. one response "no thank you, I don't want breakfast" another response "I help dig the grave" third response "I look for tracks"
(It took less than three months for the party to make it through character creation and out of the obligatory tavern into the obligatory dungeon! Speed Record for PBP games!)
Note that for combat round posts, I tend to make a post for Round 1, and then slowly edit and fill out that post as people tell me what their actions are. the same thing for rounds 2 and so forth.
If Dalamar's character was going to encounter something bad on his scouting mission and there was going to be combat, I would have delayed the combat until everyone had had a chance to comment on whether they were going with him or not.