My cat Biscuit has stared at the front door every day since Day 1. Day 1,218 now. Minutes per month spent staring at the door: rising. Whatever he's waiting for, he's waiting for it more.
The full study is on my page, with figures and limitations (Biscuit is aware of the study; sample size: one cat; observer bias: I love him).
Has your cat done this? Please give the behaviour code. — R. Adeyemi-Clarke