The light should clear after the bike has been through
three heat cycles.
A heat cycle is:
Technical answer
The temperature rises to 72 degs C or more
If
The temperature had to rise by at least 23 degs C in order to get to 72 (i.e. was 49 or below to start with)

:roll:
Real life answer
Running/Riding the bike for 5 minutes and letting it cool down after :-D