You can install as many circuit breakers into a load center or breaker panel as you want too as long as there's space for the circuit breakers.
There's no way to put too many breakers into a breaker panel because you're limited to the amount of circuit breakers that will fit into the breaker panel.
Your main breaker in the breaker panel which is either 100 AMP or 200 AMP depending on your service entrance size and meter box will limit you to that amount of AMPS that can be pulled through the breaker panel at one time.