Charging time depends on several factors, including the system size and type of power input.
Charging Times for 1 Tank PRO connected to 1 Yeti PRO
Fastest Charge Time, Low Power PV (Solar): <24 hours
Fastest Charge Time, High Power PV (Solar): <2 hours at 3 KW input
Fastest Charge Time, AC Input (Fast Charge): <4 hours