I recently applied to an executive master, and prior to accepting the offer, I discussed it briefly with my employer, who seems supportive. 

I didn't get the class schedule until closer to September and part of the schedule indicated a couple full friday per month, for 2 years. That seems like a lot of work days to me to be missing. 

I brought it up with the school (since previously they told me it would be Friday afternoon to evening, not 9-5 work schedule on Friday), and they replied that I was the only one in the class who has indicated to have problem with this. (I don't know if I have a problem even, it just feels like a lot if I think from the employer perspective, so much that I feel uncomfortable to bring it up). 

I know executive masters have always exist, and the condition is that, I must maintain a full time work scheudule to complete it, but I have never worked with someone who's done an executive master. I wonder what the general workplace acceptance is about these things? And if my employer has problems, how and what I should suggest as an alternative?