Drac reported some numbers about mana regeneration yesterday in Discord. I'll copy paste the numbers here to support someone willing to do some research.
[CEV] Drac Yesterday at 12:26 PM
Is this accurate at all? No armor
Channeling 0 24 mana regenerated in 1 min 41 seconds 4.2 seconds per mana
channeling 30 24 mana regenerated in 43 seconds 1.79 seconds per mana
channeling 100 (assumed. based on Wiki) 1.0 seconds per mana
Leather Armor
channeling 0 24 mana regenerated in 1 min 48 seconds 4.5 seconds per mana
channeling 30 24 mana regenerated in 1 min 3 seconds 2.625 seconds per mana
channeling 100
1.466 seconds per mana (extrapolated from 30 channeling compared to 100)
1.07 seconds per mana (extrapolated from 0 channeling compared to 100 channeling)
assumptions were made.
Arth'Sath (talk) 03:00, 5 February 2019 (UTC)