I would give it 10 minutes if you parked the bike in certain locations. Seriously if you need it for controlling the motor unit as is the case on Bosch get one that's removable and get into the habit of removi ng it each journey. Takes less time than locking the bike. Then its out of the weather 95% of the time.If you were to mount a display to the handlebars of your bike and then use it for a daily commute, how long would you expect it to last?