Vat cleaning frequency

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Hi all!

I'm new to resin printing and I'll probably be printing only about twice a month.

Would you recommend emptying and cleaning the resin vat after every print, or is it okay to leave the resin in the vat for a couple of weeks if I know I'll be printing again soon?

Also, the room where my printer is located is quite bright and gets indirect sunlight (I'm in southern Spain, so it's pretty sunny). The printer has its UV cover on.

If I leave the resin in the vat for two weeks, is the only thing I should worry about a thin cured skin forming on the surface of the resin, or are there other problems I should be aware of?

Thanks!