I donno If I had to guess Id say for me anyway Im gonna need 150 hours
Im about 55-60 hours in now... Im lucky though because the laser takes out at least 60-70% of my hair and almost all of it on the upper lip, chin and jawline
Ive had three laser sessions now and hopefully even less dark hair will come in this time... Right now Im in the sweet spot about 2 weeks after the laser where its all finally fallen out... Only the white/grey hairs will grow for at least the next month then the darkies that aint dead yet will come back again.... Real nice though now because I can finally really see the progress from the electro
I guess it depends on how much beard you have and the skill level of the electrologist
Mines been at it for 25 years and she has done at least three MtF women Ive heard it can take up to 400 hours though and 15-20K 
Im about 55-60 hours in now... Im lucky though because the laser takes out at least 60-70% of my hair and almost all of it on the upper lip, chin and jawline Ive had three laser sessions now and hopefully even less dark hair will come in this time... Right now Im in the sweet spot about 2 weeks after the laser where its all finally fallen out... Only the white/grey hairs will grow for at least the next month then the darkies that aint dead yet will come back again.... Real nice though now because I can finally really see the progress from the electroI guess it depends on how much beard you have and the skill level of the electrologist
Mines been at it for 25 years and she has done at least three MtF women Ive heard it can take up to 400 hours though and 15-20K