The duravat needs to recharge for 45-60 minutes after use. And to get nice crisp prints the vat window needs to be cleaned before EVERY print job. The Core's projection window needs to be checked regularly and also kept perfectly clean and lint free. Use a soft microfiber cloth.
After printing, I set the duravat (with lid attached) on a sloped surface so the resin is not touching the window and no light can enter from below. When I'm ready to print I remove the lid, wipe the vat window with a microfiber cloth, put the vat in the machine and go!
Our duravat has not leaked a drop in 7 months of (almost) daily use.