I quit using it when I felt I could take deep breaths without it feeling uncomfortable, and it was easy to do. I struggled at first, but I kept it up several times per day until it got easier, maybe 5 days or so. Hope this helps!
~Jan
58 yo female, 5'9" HW: 297 SW: 285 Surgery W: 252. CW: 224.8 GW: 160
If there is no struggle, there is no progress. ~ Frederick Douglass