10nm and a 1000' feet always works well.
Likewise leave the minimum altitude in the holding pattern clear in case the aircraft on the approach overshoots and has go back to the holding pattern.
These rules do not apply if your are flying a Learjet and going to the Bathurst care races with VIP's on board, and like wise if you a VFR pilot stooging along in marginal VFR conditions don't make any calls entering/transitting the CTAF(R) to save landing fees and talking to those pesky IFR pilots who want to know your position and intentions.