I used to go to office with this road.
First day, I met many people in the road, I don't remember who I met.
Second day, I met many people but some of are similiar to yesterday.
Third day, I met many others but I recognise one of them
Forth day, I met many but I started to search for the one I recognise yesterday.
Fifth day, I met many people but when I met her in a juction I knew I was in time.
Many days passed, I always met her at that junction or nearby that juction and I can estimate I was in time.
Twenty-th day , I didn't met her and I realised I was late.