Nice to see, but 7 days must be reached even with GSM on.

Sometime I have reached about 5.5 days using it (some calls and some sms, no other usage).
Of course without u-boot, with it never beyond 3 days.

I don't know what is the consume of GSM Chip on idle but with GSM Off and N900 on a drawer I think that battery life (new battery) could be more than 12 days