BOAC, I base my approach fuel on an average of 40 track miles from the hold to the arrival runway, so always look to have that plus diversion plus reserves as vectors start off the hold. So personally, as long as the vectoring doesn't exceed 40 miles, I'm happy, but I'd like to know about planned track mileage if we're not talking a standard 24 mile dogleg.
Preference however would be once more round, then standard dogleg rather than extended vectors any day.
See you at crew report!
£6