Question... Have any of the bubs gone from taking 30min to feed, to 10-15min and then they are done?? Only one side!?

Eleni has done this overnight and again this morning.... She zonks out after 10-15min sucking on the one side, then I can't wake her to go again.. she flat out refuses and throws those cute little lips out! Do you think she would be getting enough in that time to last her...? Overnight she fed every 2.5-3hrs.