I've had mine for about a month now. I'd say I'm getting about 4-5 days on average if I don't recharge. Closer to 4 than 5. I try to put it in airplane mode...it lasts a lot longer that way. I don't know about 10 days...but I'd say 6-7 if I leave the network off.
That said I picked up a few extra micro-b usb cables for like $7 shipped at monoprice.com (my favorite cable store) so that I can charge it if needed while I'm at work, or from my laptop if I'm at school.
If you're not familiar with monoprice for cables, you should be
