There are a few ways to measure how long you have been friends on Facebook. The easiest way is to look at the number of friends you have in common. This can be done by looking at your Facebook profile and counting the number of friends who are from the same city, state, or country as you are. Another way to measure how long you have been friends on Facebook is by the time it has taken you to connect with each other. This can be done by messaging each other or by commenting on each other’s posts. The final way to measure how long you have been friends on Facebook is by the number of times you have commented on each other’s posts. This can be done by looking at your Facebook profile and counting the number of comments that are from people who are also friends with you.