Sportal.co.nz 05.Oct.2013Getty Images
In that time New Zealand will have to cope with a desperate South African side playing in its own fortress at Eden Park – the first time McCaw has played a Test at the ground.
"It's a Test match to test yourselves," he said of the Championship decider.
"I think that first 15 minutes is going to be pretty key to the game to be honest. We've talked about that.
"Even if the Rugby Championship wasn't on the line, it would still be the same battle because of the pride these two teams have," he said.
McCaw said he didn't know South Africa would approach the game but New Zealand would be looking to perform well enough to win the game.
Quelling the effect the home supporters could have on their side would be one way of dealing with the noise that can envelop the ground.
"To be honest, whenever you play over here in South Africa it's usually like that. It would be nice if we could silence them a bit," he said.
While all the players had played Super Rugby on the ground, McCaw said New Zealanders grew up knowing that it was a ground with a rich folklore and they knew it was a ground to test yourself on.
"This will be my first Test here and the boys and I are pretty excited about it," he said.
McCaw was happy with his knee and said he was fully fit.
"I wouldn't play if I didn't think it was 100 [percent]," he said.
"I've made sure I've done everything right. I have done all I can to get fit and I feel like I am there," he said.
McCaw talks to media at Captain's Run before Ellis Park Test 6889 views