I don't have an exact estimate, as it depends on the gear and prayers you plan to use (or not use). I would suggest buying 35K worth and selling what you don't use if there are leftovers.
Alright I stick with that rue thanks i am useing Full armadyl Fury Glaiven boots and Mercenary's gloves and i am useing the normal Prayer book with just Melee Protecting from the skeletons If you meant what my Prayer Level is Its 99.
I know this is a touch off-topic and I can't remember where I saw it, but from what I remember when I chinned 99 range, it was more efficient gp/xp and timewise to use the +10% range prayer too. Whether or not that is the case now I'm not too sure, but I doesn't hurt to consider it. GL!
Thanks for the tip Rsprod I have Already been useing it many times its draining alot of my prayer sometimes i was close to die one time were I didnt pay attention to my prayer was draining and also I need to pot up more than i do when i use it.
The way I did it: Prayer bonuses. Use a prayer book, mitre and a monk robe and even a god cloak/skill cape. Then fill in the blanks with the best range equipment available. Finally, pot range and definitely use the hawk/eagle eye prayer. OT: depends if you use red or greys and where you are chinning but I would suggest no more than 40k definitely!