How should a breast pump flange fit

Breast Shield Sizing Guide - Living with Low Milk Supply
Getting a correctly-fittedbreast shield is crucial if you pumpbreast milk. In this breast shield sizing guide, I share my insights on how to choose correct.

Which Flange size should I use? - Willow: Wearable Breast Pump
The flangefit depends on your nipple size, breast shape, and breast size. If you experience excessive discomfort or rubbing when appropriately aligned, the Flange Tunnel may not be the right size for your anatomy. If you think you may have the wrong flange size, call us at 1-888-WILLOW-3.

Pumping flanges fitting question - Breastfeeding - What to Expect
How are flanges suppose to accurately fit? I'm starting to think I may experience pain because my flanges may be too small. I have huge breasts and I use a size 27 mm but that may be too small?? I'm not really sure. It doesn't hurt a lot but it does sting a little. I get about 2oz each breast but wondering.

How Long Should I Pump? - - Health and Welfare
How Long Should I Pump? If you have an excellent pump and pull down fast, it ought to take you about 10 to 15 minutes to clear both breasts using a double pump and 20 to Thirty Minutes if you are pumping each breast individually. A great pump will cycle (suck and release) as rapidly as a baby.