I currently don't have anything in my TOS that mentions how long someone has to pay me before I drop their slot. I do have a clause that says I can drop a slot for any reason at any time, though. However, due to the circumstances, I need to make up the amount I'm missing before my trip. I will also need about two or three days to comfortably finish a commission of that type before I go.
How long should I wait before I inform them that I need to move on? I made it very clear when I posted this journal that they were for the trip, and that I would have them completed and delivered before June 9th, so I could use the funds. Of course, I could be jumping the gun on them approving the sketch, but I figured they'd send payment after six days by now.
Edit: While I was at work, they sent me payment. Phew. Thank you guys.