I sold something on Sunday, the guy just paid me today without any contact before that. I find it’s not unusual to have a bit of delay, maybe they are selling things and are awaiting payment etc.
I’d maybe drop the buyer a nice note tonight, just checking if everything is okay, that’s it’s cool they haven’t paid yet but could you let them know if there are any issues blah blah blah – you’d just like a reply back that the intention is there to pay basically.
A week is long enough. Relist it on Sunday.
Don’t forget to also put a ‘payment not received’ request in to get your fees back on the original auction otherwise the fees will get taken off regardless. If the original buyer doesn’t accept the non payment it takes 2 weeks IIRC to get refunded.