Power pumping does exactly that, but you complete the extra pumping sessions in one hour each day rather than spreading them out. (breastfeeding-magazine.com)
Typically three times a day is the average number of pumping sessions for a full eight hour work day. (evenflofeeding.com)
If you can, try going a little longer in between pumping sessions like every 2 and a half hours so your body has more time to replenish the milk. (lansinoh.com)