Are we talking Classic or 744, or pax or freight? This is a 'how long is a piece of string?' question. Brake temps are rarely a problem on a pax 744, but try a classic freighter with steel brakes at MLW landing at Bangkok. We allowed 1 hr for a tech stop, but the brake temps nearly always kept us on the ground for longer - even with the use of cooling fans. And 110 tonnes of freight off and 110 tonnes back on again. Try two and a half hours minimum.
As for pax 747s, I've done a 40 minute turnaround (no fuel) but you will find an aircraft coming in from an Ultra Long Haul flight will need a minimum of two hours. Preparing the cabin will usually take that, and 145 tonnes of fuel takes about over an hour to pump.