Any other good, but free time tracker that integrates with Asana?
We use Everhour and love it. We tried Harvest, but it fell short in several areas. Mostly our love comes from the fact that it has a Chrome extension that allows us to use it for anything.
I use custom fields in Asana to track time. I guess it depends how accurate you want to be, but for me 15min time blocks were sufficient.
There are several great threads on time tracking in Asana. This one is a great starting point: Do you track your time?