It is normal for a T-line to take between 5-48 hours to bleed. Personally I prefer them because once the system is bled, they flow better, and are smaller than a reservoir making it easier (for me) to manage it.

Part of the reason your T was having trouble bleeding was the fact that air floats UP. If you have the T positioned somewhere that allowed the air to float UP into the T, then it would have bled much faster.

Regards,

Miso