No theres nothing wrong with that as long as theirs no off smells that could be an indicator of an infection. I cant remember if you said you pitched a starter or just a smack pack. When I was pitching just solo-smack packs I would tend to have a long period of activity, when I am pitching big starters the activity quickly drops off between 72 and 96 hours. Its not unusual for saisons to show activity for a long period of time.
The gravity check also gives you a chance to taste and see if theres any flavor/aroma qualities that could indicate infections or other problems.
Smack pack, although it was a 2.5g batch, and used the whole smack pack... So it was more than enough.
I think i'll wait until the activity dies a bit. Test my new refractometer (here in 3 or 4 days or so) and take more than enough so I can taste.
I'm very unconcerned about the infection currently. It's smelling great, looks healthy, just more so concerned about whether it's warm enough.
Thanks!