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It's really up to you, they will all work just fine.
I did 2 frost.
Then 1 frost 1 fire.
Now I do 2 fire.
Mobs die so fast, they almost never touch me. I never need cc beyond the occasional sheep(s).
It's also pretty mana efficient, so I don't have have to sit and drink very often. Just kill a mob, run to the next one and repeat.
I like deep arc/fire because you get the most awesome burst DPS ever. POM-AP-Pyro is insane even with one mage. Also, arcane missiles will keep hitting opponents who run out of LOS as long as they were in LOS on the initial cast.
If you have 2 3-minute mages, then you technically have a 1.5 minute mage.
If you 3-box, then you have a minute mage.
4-box would be a 40 second mage.