Forest Gump

This arrived today.
In January I ran every day to raise money for the charity 'MIND'.
Kept it going in February, then decided to do it for Lent too.
67 days later I have ran every day this year and amassed 315 miles in the process.
When shall I stop?
Being a bit OCD it will have to be something 'tidy' like 500 miles or 100 days!!