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Battlefield size at TL15 is only restricted by weapon range, because gunship battles (I don't think they call them grav tanks by TL15) are more like air combat. Are you thinking of a more conventional ground or nap-of-the-earth battle?
As for time - this depends on the weapon/armour balance. Most gunships I have ever designed get taken out very quickly when up against other gunships with heavy fusion guns. He who hits first, wins - especially if he hits with tac missiles ...