[shrikant]

I can vouch for this. I use a Blackberry wall-wart type charger for my Pi, and it's been rock solid. I only power it down it when I'm off travelling someplace for more than a day.

    pi@raspberrypi ~ $ uptime
     10:58:03 up 17 days, 13:45,  1 user,  load average: 0.00, 0.01, 0.05
    pi@raspberrypi ~ $

[llgrrl_]

Of course if you never plug anything in, it will stay up for a long time. The problem arises when there are things being plugged in and out.

Many USB devices don't work with the Pi. It's pretty picky.

    pi@mia ~ $ uptime 
     15:40:15 up 94 days, 23:03,  1 user,  load average: 0.00, 0.01, 0.05

[shrikant]

I have a 1 TB USB HDD plugged in at all times (separately powered though), which acts as my NAS.