I have actually done up to 8.5 hours of electrolysis in a single day without any anaesthetic, not even a topical anaesthetic like EMLA. Looking back, I still wonder how I handled that as the pain in certain areas; upper lip, lower lip and the two side of the throat..., was quite excrutiating and also had me breaking down into tears more than once. Two to three days to recover from the swelling afterwards too but as I have no electrologist close at hand I opted for a long sessions with about two months between each session.
Happily I am now almost finished and in total it won't have required more than 50 hours. My electrologist, a trans woman, and I also learned a few tricks along the way. EMLA, (which you can buy online without any presciption), works far better when combined with DMSO. The latter product facilitates penetration of EMLA through the skin.
Another product you may be able to find is topical lidocaine which is sold over the counter in certain countries and also seems to be available on line. I just checked.
Hope that helps.
Donna