How many days do I harden off clones?

[deadkndys]

I just started hardening off my clones a few days ago. How many days should I harden them off for? On Thursday I gave them some late evening sunlight for about a hour and a half. On Friday and today I gave them 3 hours of morning/noon sunlight(9-12) then put them in shade for the rest of the day.

 

[VerdantGreen]

1-2 weeks is usually enough... but also keep an eye on the weather and look for a few calm days and mild nights forecasted.