Okay, lets say the mimimum requirement is 10 members. could be more, doubt it will be less. Say it takes roughly one hour for each member to get the resources required, that is 10 hours. From my understanding people play on average 2 hours a day, so that makes it 5 days for a single person on average. Now lets say its 20 people, an hour for each member, that is 20 hours, that on average is 10 days. If you want to jump you would have to grind it out for days to get it jump, if you don't grind and get the resources in bits and pieces, that could take weeks or even over a month.
Of course this is all speculation. It could take 2 minutes per commander, if that is the case, they might as well remove it entirely.
It takes minutes to refuel ships as they exist now, or they are fueled instantly at a port. Does this make the feature useless? No
I think carriers need to be balanced because if they take too long to gas up, they might as well just tie it to the server tick. I think it would be minutes not hours