Indeed 2 weeks seems for us largely under estimate but for a professional player it might be true, As for me I changed them usually after one or two month even if I had several gigs but I also don't like too much the "brightness" of new strings: For my style of music (mainly Blues and Soul) there's no real need for "funky bright strings"
Guitars:
1978 Fender Telecaster Thinline Custom USA, New Nash TL-72 Thinline Telecaster, 1965 Harmony Meteor, H71, 1986 Fender Telecaster Esquire MIJ, New Martin J-41 Special, 1933 National Duolian, 1941, New Eastwood Mandocaster 12 strings
Amps:
Tweed Vibrolux Custom Denis Manlay, 1976 Fender Deluxe Reverb Silverface