lol..
Okay, I did the practice round over and this time I didn't purchase any minions, spent all money on armor, didn't waste time getting flags and killing the AI. Nope, I didn't bother making the game realistic at all so with 25,000 to start and high gold I got the time down to 4:34. That was with normal towers, But seriously folks, your not going to start out with 25,000 and high armor and such. BUT, if you would like to challenge me in an oak vs erebus match on the citadel map with 25,000 and high gold at level 20 I'll do that as well.
That's the point.. you don't need 25000 gold. I've already told you how much you need. Want me to post the replay? It was literally 4 items:
Hauberk - 1750 (200 minion hp)
Vinling Helm - 2000 (200 minion hp)
Gladiator Gloves - 450g (+4 dmg +5% attack speed per minion)
Gloves of Fel-Drakur - 3500g (+8 dmg +5% atk speed per minion)
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7700g. You can acquire the whole thing by 10 or shortly after. You don't need high armor on the minions.. all they have to do is take out 3 archer towers (4 if you want to take out one by the crystal so reinforcements take literally 0 damage going over). It took me 2:25 to accomplish this.. and I sat around waiting forever to get the stupid creeps to come.
It's entirely realistic. The only question is: Can you avoid dying to an erebus multiple times? Do you have the patience to sit around for 15 minutes doing literally nothing? Personally I can't handle doing that against a real opponent. I like to go out and engage.
p.s. In a "real" game, you're not going to be getting flags, minions, or citadel upgrades. Unless your opponent is stupid, you're not going to get any kills either. You will never take down every tower (why do that? You only *need* to take down 3) You're literally going to be leveling to 10, focusing your spirits on the enemy as best you can, and waiting. It's how a pure minion oak works.