Also the 1-10 scale is subjective, if you have, as far as you can recall, never felt that level of pain before, it is the most pain you can ever recall feeling, that is a 10. 10 is described as or referenced by "The most pain you have ever felt" not do you think you could feel more, just the most pain you have ever had up to that moment. Kip scale adds some more detail and thresholds, but it does just boil down to "Is it the worst pain you have ever felt".
For my perspective, at one point in my life the kidney stone I had and passed would have read a 10 to me, but thanks to these lovely things and a reshuffling of my pain scale it would now fall around a 5 or 6. So until something hurts more, the most pain you have ever had is a 10, you feel more eventually, that becomes the 'new' 10 and the old '10' becomes a 9.
Anecdotally, I have also begun using two scales for medical issues. My cluster scale for cluster appointments, neuros etc. But I wipe cluster pain from my scale if I go in with say stomach issues or the like, otherwise your pain scale is wildly skewed compared to what a triage nurse would understand. You tell a triage nurse kidney stone pain is barely a 5 they look at you like you are off your rocker.
For the op I have been somewhat lucky as full on "10"'s are a once or twice a week occurrence, the rest falling below 10. The ending of this winter where I live has been pretty chaotic, cold, warm, hot, windy, chinooks, snow and cycling pressures like nuts, so the other day I got my first 3 "10"'s in a row with the rest that day being just below that. My attacks, lucky me, go about 2.5 hours, it seems the 10's calm a bit after 1.5 hours but that could simply be exhaustion and a kind of mental numbing to that amount of pain over that amount of time.
so for me that would make it 7.5 hours of the most pain I have felt in my life, with maybe 1.5-2 hours pain free split amongst it.