3.4 Hardening of glue
WARNING: This page is about a different car, the 2013 BMW X5 M, 2012 BMW X5 M, 2011 BMW X5 M, and 2010 BMW X5 M. However, it is still accessible from the selected car via links, so may be relevant.
Hardening speed depends on the ambient temperature.
For this reason, the mirror base must be secured with adhesive tape or similar for at least 3... 4 hours.
After 12 hours have elapsed, clip mirror into place as soon as possible.