Has anyone tried this long term like 6 months or more for a couple of hours a day?

What were the results?

Following. I'm doing a few hours per week (post 16-day retreat) with most days focusing on TMI-related practice. If I get the sense progress is possible with 1-3 hours per day I will go back to fire kasina with a vengeance. Hope there are others working this at that level in their workaday lives....