What Level to Start an Alt?

[Jimjam]

I like to have characters in teens, twenties, thirties, fourties and fifties grouping at any point in time. Preferably several for each band parked in different regions.

I also try to have someone with keys in sky and maybe a couple of other casual raid spots parked too (Kael, west tov or hot).

Even after all the time I've spent here I don't feel like I've done more than scratch the surface of the content.