Yes, gasing up a large group takes time. Years ago, we drove a few hundred moles as a caravan. There were over 100 vehicles in the caravan. We divided them into groups, with a leader in each group. We made at least 2 fuel stops, each way. As I recall, we were required to report topped off, and the stops divided people across several gas stations. The even-numbered groups used stations on the right side of the street, and the odd-numbered groups used stations on the left side of the street.