Will my ss be affected if I drag my pump time from 3 to 4 hourly? TIA!

I think it varies for individual. Some may or may not experience a drop since it is only an hour different. You may wish to monitor when you try it out. If u expereince a drop, mayb u can compensate it by increase the pumping time? If still able to meet the demand of your baby then shouldnt be an issue. It really depends on your needs of dragging the time. Whether the purpose is because u want to wean off? Or because of work? Or because you need to rest. For me wjen I drag from 3 to 4hrs, no change. When when I drag to 8hrs because of work, I can see a drop. Thus when i reach home I'll latch my baby.=)