i bot mine 8-12 hours over night and get from 25-55 a day.
5 hours at 2 games an hour
you could get anywhere from 10 zeal to 30 zeal so anywhere from one hundred days to a little over a month. I suggest bot more and for extra strength xp use the attack players option. I barley get kicked from games and get around 100k a night which converts to 3m a month, but that leads to hitpoints xp and idk if you want that or not.