Tolerating 30 minutes on the upper lip is related to the skill and very close to that, the equipment used by the electrologist. You can schedule weekly appointments to maintain the upper lip or you can clip the hair if you go longer in between the sessions. I would skip doing electrolysis if you are going do any temporary solution that PULLS out the hair.
Indeed, the first 6 months is the hardest, but you must stay loyal to the plan - 9-18 months and put in the hours that are needed to clear and maintain.
I know enough by now not to mess around with ANY type of plucking while treating an area. I was fine threading myself my upper lip until now because I thought it was convenient (and it is, in a way, I much prefer it to wax), but since I realised I can tolerate the pain of electrolysis there, that's it. No more messing around.
Having good results on the chin has also helped me decide I should get rid of the upper lip as well, and I'm thinking about stray hair on my upper arms that bother me. Once you start, you always find more to treat.