Tankers at RS 2H at Marham, 1H transit to abeam LU, another to north of Saxa. So, 4 hours - minus however early they managed to get airborne (and to be honest they usually managed under 60 mins).
To manage to meet P-time the norm was to scramble Q1 to honour the threat, then Q2 in sequence etc. If you were lucky you could steal a tanker from a TTL as Tansor Mobile, and if activity was forecast preposition tankers at LU.
I can remember one exercise where the Bears kept coming and, after exhausting all the available F4s, the BK then WT jets were generated. IIRC they landed at LU to refuel before heading north. F4s, Ltgs, Victors and VC-10s ended up scattered all of the sky and the tankers were OTRing wherever they could find the fuel.....