I've left engines on cradles for several months. There are some good tips for storage.....leave the rocker arms loose so there's no pressure on the valve springs....spray a little WD or fogging
oil in the spark plug holes so the rings won't stick to the cylinder wall. Every week or so, it would be a good idea to spin the
oil pump with a drill motor and turn the crank a couple turns.
I don't see problem at all with letting an engine sit though.