Right, lets do the math.
5 gallons is 3 minutes. 50 gallons would be the 30 minutes I quoted.
Maybe it got lost in the translation, But, I was agreeing with you!
Others thought that you were stating that you could fill the tank in 2-3 minutes using multiple gas cans.
Others this you can get 50 gallons on-board from a pump in well under 5 minute.
It takes longer to refuel than you might imagine. Actually time it next time.
There is more confusion in this thread than I have seen in a while.
Filling at a Private Dock is going to take a while and is not the issue.
Filling any boat on the water is not against the Law, it is against the Private rules of the Property Owner, Marina, Parks Dept., Others.
My local Public Ramps do no allow refueling.
I can legally take the fuel away from the ramp, out in the lake, and fill up as long as I don't spill any.
The OP is at a marina. (I think! ??)
Filling from cans at the marina is not an option if he intends to follow the rules.
Sneaking the fuel on-board is one option.
Pulling the boat to a gas station to refuel is another option.
Spilling a little fuel in the water is NOT an option.
Making the transfer in a safe manner is the issue.