I'd say it's on average at about 2-4 posts per day, judging from the last few months of activity. And, regarding keeping up, it depends on what you want to do with your characters in Haven! Event stuff you'd want to check out once a day at least (the mod staff is incredibly prompt with times, so you can coordinate checking up that way), but normal day to day stuff I'd say once a few days is plenty to be very active.

The biggest difficulty that people have (myself included) is simply the amount of characters in this game. You would not be able to tag 'em all, so you'll have to kinda pick and choose your CR and people you want to tag vs trying to not overwhelm yourself!

Another common difficulty that I've heard people express is that it's a bit difficult to get into the game's plot, and if you're not around during event time for a few days then yes you can definitely miss out. However again the mod is super prompt and schedules when events go, so if make yourself largely available during event week I feel you'll be fine.

Other than that, the game is very open! The only limitations you'll face as a writer are with the setting; otherwise the game is very villain friendly, very player plot friendly. The mod's a gem and is worth every single bit of praise she gets and then some.