Thanks to the stringent control of all hardware products, LCD should have MTBF (mean time before failure) of at least 50000 hours in order to sell to major developed districts. If you're not purchased the hardware in some distant under-developing countries, you can safely assume that it won't fail within 50000 hours of constant use.<Br><Br>

Flynx is right, you might not see your N900 after 5 years. so 50000 hours ~ 5.7 years should be fine for you.