How long until my boobs stop hurting ?

Rebecca

Ok so I’m no stranger to breastfeeding, my oldest nursed to 20 months and my middle nursed for 15 months we are 10 days in and the first 30-45 seconds is still toe curling bite my lip painful! It obviously doesn’t hurt the whole time just the initial latching. How long until my nipples toughen up? I don’t really remember the time frame of these early weeks? Anything I can do to speed it up or help with this? Thanks!