Just counted on this yesterday, i have planned 15 chapters ( but will probably be more because so far I had to split some chapters into 2) and that will land in about 700 pages... and if i do 1 page a week, so 13 years? xD but already posted the comic for 2 years in may now, phew, I dont know if its encouraging or not 
But when my hand isnt hurting to much I can do more than 1 page a week once in a while 