One person spending 10 minutes to resup takes off 20 minutes since 10 minutes passed as well. If 5 people are resupping thats 2 hours off in 20 minutes.
Good luck finding 5 players willing to make
three 10 minute flight/drives to resupply -- the most boring aspect of the game.
Also, don't forget to add the time required to resupply field assets that are destroyed while the strat resupply effort is underway. More time spent in the most boring aspect of the game.