DR lo-rider nickels last me for months, I play for 5 or 6 hours at least per day too.
I've just started to use Prosteels, they seem to last really well too.
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Marleaux M-bass 5 String
Zon Sonus 6 String
Modulus Quantum 6 String
Jaydee Mark King Series 2
Markbass LM3
Acme Low B2
Well take this as you may - as you may know I like old strings. But that may be because I've found that I don't have the kind of acidic sweat that kills strings that some people do.
Anyway, my favorite six string sets are LaBella Deep talkin' nylon tapewounds and Fender "Super Bass" nickelplated steel roundwounds. The Fenders settle down instantly and last forever. The LaBella DTB nylons take a long time to settle in but also last forever.