Courant number max value
 

Hi everybody,
I'm doing a simulation of natural convection in a room with DENSITY-BASED SOLVER-Implicit: after 1000 iterations with the Solution Steering now I deactivated it and I'm trying to change manually the CFL.
It seems that increasing the Courant number to 500 doesn't change very much the solution, so I think it's possible go ahead.
Should I keep increasing CFL or a too high value is irrealistic and wrong?

Thanks in advance :)
(sorry for my bad english, if I haven't explained well my problem, tell me!)

Plus I may want to know the differences between implicit and explicit solver (advantages and disadvantages)