Sri Guru’s letter:
For many, in two hours of pranayam, not even two correct pranayams take place. Mantraheenam adakshinam. Tat tamasam udahritam. “Dakshina” = To remain steadfast in the post-Kriya state in its peace. Many don’t even pay any attention to this. Not reviewing initiation and instruction from time to time causes all sorts of problems.
Instead of doing 5 hours of pranayam, if you could do just 2 correctly, try to do that. Everyone should try to practice correctly like this.