arm hair and electrolysis

Hi- a few days ago, I sent in a post about removing arm hair with electrolysis. Sorry to belabor the point, but so far, I have had 2 clearings (10 hours all together) but there are still hairs popping up all over the place. Just to boost my morale, any ideas on how many more clearings I can anticipate – 5,6 . . 20, 40?!