Are you burning them? I would estimate 70-100k/hr depending on how efficient you are. Note there are ways to maximize xp such as using a pyrefiend follower as a tinderbox to get an extra 10xp/log as well as a saved bp slot since you don't need a tinderbox. You can also equip the ring of fire(*requires 62 fm) and the flame gloves(*req 79 fm).
"DO NOT USE PYREFIEND FOLLOWER. It's 1 tick slower (1.8 seconds instead of 1.2 seconds) therefore you get 10xp extra at the cost of significantly slower burn rate. But ring of fire and flame gloves are really really useful." ~Repealer