I got a batch from Monday the 22nd that haven't approved yet. I noticed on the previous ones mine were approved over a span of 2 days or so.
When they first ever released them I had mine approved the next day. However, now that they are released pretty often it has been taking several days.
Here's the deal: some, umm, fucking retard, decided to try and make an autocomplete script for Taggered HITs. The Taggered people found out about it, don't ask me how (lol!) and now they are going back through all the completed HITs from this past week to see if any of them were done using that script, or any others. Yep, it's time consuming and yep, they are pissed. I would expect to see some suspended accounts real soon. And, if they decide to not come back to mTurk, I guess you'll all know who to blame... Keep up the good work, fucktards!
I never had any issues with them approving but they do vary. If what yep_right_whatever said is true, I'd expect it to take a while. (Glad I didn't risk using that script. I know someone on here was using AutoKeys or something like that, but I never tried it - is that the same as the script you are are referring to?)