How long until its safe to put a hamster back in a fly sprayed room

[TsukiCatHammy]

Hi guys, I have an African land snail and had an issue with fruit flies (they lay eggs in the soil) and had to use fly spray, hate the stuff but really ran out of options as my hammy isn't too well and didn't want any mites getting on him if they laid eggs.

I took them both downstairs to my bedroom (yes my bedrooms downstairs, my flats weird) and sprayed the room and kitchen upstairs.

I was wondering how long until it would be safe to go back up with everyone, all windows are open now and the barander door. I used Tox fly and wasp killer but it doesn't say how long. Anyway, if anyone has any ideas thanks in advance... I hope to never ever have to use this stuff again