How Longs safe between colours/coats?

[JezT]

How long is safe to leave between coats of paint? I want to start a shell later tonight (Thursday) but then won't be able to get back to it till Sunday. I'll do a couple of colours tonight and leave the rest protected by Liquid Mask...... Does it matter that the first colour will dry out completely before laying down adjacent colours? Will I have problems removing the Liquid Mask?