How to maintain dyed red hair?

I use ion medium intense red blonde, which basically looks like this; http://i40.tinypic.com/350011e.jpg.
How often should I redye? I did it on Saturday and the color's still pretty vibrant. I've had multiple shades of red before, but never kept one color long enough to think about what to do when it fades, lol...

I use the Everpure moisture shampoo and deep conditioner for color treated hair (100% vegan), shampoo everyother day and condition everyday.

Would it be bad if I redye'd every weekend? or should I wait a two weeks or what? Please help!
Thanks!
 
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