I switch through phones often so the current one is about 4 weeks. I've gone through a MPX220, a treo 650 and will hopefully be trying out a Qtek 8500 pretty soon (and hopefully that'll be my last one for a while)
1. Motorola V60 (1 year)
2. LG VX4400 (2 years)
3. LG VX6100 (1 1/2 years)
4. LG VX8100 (6 months. Great phone though, just switched carriers)
5. Treo 700W (1 week)
6. MPX220 (1 month)
7. Motorola Razr V3 (1 month and running)
8. Switched to a treo 650 for about 2 weeks to try it out but it was too heavy and bulky for me
9. Switched back to Razr V3