I always assumed he reset at midnight, but he's still saying "come back tomorrow" even though my last purchase was before midnight/before the day rolled over. Is he on a 24 hour timer? Sorry if this is a silly question! :)

The failure to reset is mentioned on a few things here already :) https://subeta.net/forums.php/read/8581/Did-something-fail-to-reset-Post-here/74

oh shoot I didnt realize there was a thread for stuff like this already, thanks for the link!! :)

You're welcome.. have a good day!

you too! :)