What is the maximum number of concenience outlet in 20 ampere beakers

What is the maximum convenience outlet of a breaker

Are you asking how many outlet receptacles you can place on a 20 amp circuit?

In the US, the NEC does not put a number on the outlets that can be on a circuit in a residence. However, the Commercial does limit the number to 10.

Generally speaking, at 120 VAC a 20 amp circuit will yield 2400 Volts/Amps. Of that number, you really should load the circuit to 80% (1920) of VA.