I think you realise that the problem was not that you clear coated too soon but that the wet coat was too thick. Even if you had waited a month the solvents in the thick layer of clear would still have dissolved and re-flowed the paint beneath.
Applying clear from a can is a tricky business, it is way too easy to end up with more paint than you intended. Cans have a very high flow rate and it is very difficult to see the surface and how the paint is going on because it is clear! I'm now in the habit of laying the first few coats of clear with an airbrush, gives way better control. Only then, if the surface needs a thicker coat to smooth out decals, do I hit it with a can.