There are no recommended minimum flight times for a CIR test that I ever heard of. Some examiners do a CIR flight test from Bankstwn to Richmond (about 25 NM away), you would do the ILS at Richmond then NDB at Richmond and if you were also doing the VOR you would go up to Maitland VOR. It's not about time when doing a CIR test, it's whether you can do the approaches or not. Renewals are also done from Bankstown to Richmond for ILS then you go back to Bankstown and do the NDB in the simulator. Don't know anything about helicopters though.