Is it possible? Sure, but there are many other factors that will come into play. Things such as signal strength, etc... In all honesty though, chances are very slim it will make it, unless you turn your device off at some point during the days.
Wow... a week? Like JFSikora said, the chances are very slim. How do you travel? Will you be in taxis and airports? No hotels? Unless you're going backpacking or something for a week, then you should easily be able to find places to charge your phone.
Well, I must be able to be without power 2-3 days. That include about 20 min phone calls and 10 sms or so and maybe 2- hours surf and ipod usage? Will I be fine?
