How Much Hip Rotation in Backswing?

[barnum1]

Hi,

is there a preferred amount of hip rotation in the backswing?

I have been taught 45 degrees (and then another 45 degrees in shoulder turn => 90 degrees in total), but I can't really see why. 
I guess there may be a risk getting the club too far behind you, but otherwise?

I experimented a bit, and I can do more than 45, in spite of my age  
And it makes it easier to get inside-out and avoid over-the-top. But maybe that's correcting a fault with another?

[iacas]

30-45° is good. Turn back too far and you won't get back far enough on the downswing.