If you want to take a break, you can use a special lid to cover both the paint reservoir and your brush or roller.
Cleaning and stripping
With a Roll and Go S, you can leave the brush in the handle and insert the handle through the lid. You can also insert the mini roller into the handle, then tear or cut the strip at the back of the lid and close the lid tightly on the pot.
With Roll and Go Buckets, you can store a roller in the bucket and put the lid on.
If you use water-based wall paint, it will remain usable for up to several days. Other paints and varnishes may dry out a little faster, but will certainly remain usable until after a lunch break.