I had lipo on my inner and outer thighs. The doc only took 1 liter of fat from each. Is this enough?

Most of the time liposuction is not a judgment call. The plastic surgeon stops the procedure with no more fat is able to be extracted. In the end however is the appearance not the volume of fat removed that is important.

Great question.  The amount of fat removed for any particular body area is irrelevant.  what is important is the shape that is sculpted at the completion of the fat removal.  In some patients it may take a liter of fat to be removed from each side to give a good result.  For another patient maybe two liters per side and for another patient one-half liter per side.  Everyone is different in this regard.  I suggest looking at your results first and then amount of fat removed a distant second.