My own poor n9 gets booted almost every second day, and now and then again 5 to 10 times a day at best as I need to test something in the booting process or tweak it a bit. (I am really a monster here... but my servers do better, more than two years uptime on the running record now)

However, I was just curious and checked my wife's phone uptime, as she uses her N9 just as a regular phone and it sems to be just under month uptime now;

~ $
~ $ uptime
18:25:48 up 24 days, 4:47, load average: 0.09, 0.10, 0.08
~ $