The time for a port to complete will ideally be very fast - within a business day.
But, please keep in mind that there are several factors and parties that are involved. Any hiccup in the process will end up causing delays.
To ensure that your port is quick and successful, please ensure that you have confirmed all of your porting and account information with your current carrier’s porting department. Lastly, please verify that your device is able to support an eSIM.