These are just averages. The lowest I get, and I always am not sure, is 60k exp an hour. And then other hours I've got around 103k Exp an hour. The RS gold Ivies have 75k Exp/hr. 80k is over the top. 3-4 weeks is a reasonable estimate depending on your current speed. If you're bored, you can always go back to Stealing Creation for Hatchets which give double performance. As for the Firemaking question The amount of wood burned per hour is 1000. So it will take 100 hours or less.
I received my fire cape today I'll provide you with some suggestions. Begin with equipment, and then inv: 100 diamond (e) bolts for Jad. 1 ranging potion, only apply 2 doses prior jad, or all 4 in jad. 10 brews. 15 . Super restorations. 1 Enchanted Excalibur.
Bring 1k broads. You'll be using 500-700. Change the helm from veracs or neitiznot. Legs to prossy, or verac. Boots can be rune or dragon. In terms of buy OSRS gold strategy goes, getting the 180's on either the 360's or 45's is one of the top priorities.