No extraction when not in use?

I have a Saturn 4 Ultra setup and ready to go, but have yet to attempt my first print. I'll print in a grow tent with a fan driven extraction, so I've no concerns when it's printing, but my question is about when it's not printing. My plan is to leave resin in the tank and use the vat clean function before every print to ensure no bits are sitting in the bottom. I'll have the official Elegoo vat cover from tomorrow so is it good enough to leave that on the vat when not in use and therefore not need to have any extraction running 24/7? Or will the voc's / fumes still escape and be a problem? I'll be printing in a small room with no perm ventilation (I'll run some ducting out a door when printing and take it back in when not printing) so it's not an option to have it running 24/7 or I would. Thanks.