Without knowing what the current draw is it will be another guess as to the Ah requirement to run for an hour or 2.
My DIY drone with the 1800mAh 120C LiPo lasts about 9 minutes.
Those batteries are 1C and would not do well running motors requiring more than 1 amp.
This one with 15C would work better.
would work better.
If the battery does not have a C rating "assume" 1C but could be less.