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The rough eye ball is 1% crit = 8mp5. That is EXTREMELY rough though since the exact conversion depends on FoL vs HL and will vary. I linked something that did the math once but bobs knows where that is now
I did the math on this a while back, and here are the results:
FoL (max rank) spam: 1% crit = 3.5 MP5
HL (max rank) spam: 1% crit = 12.5 MP5
Of course, you will barely ever be in a fight where you can just stand there and spam either of those spells, so you will get less MP5 from crit. Between running around, Cleanse, etc..., your actual mana regen from crit gets significantly reduced. If you generally spam FoL, or a downranked HL, then you're probably getting around 4-5 MP5 worth of regen.