I can understand why you guys are worried about this but what is the problem with trying it and seeing how it goes - you could also negotiate with him about dif

I can understand why you guys are worried about this but what is the problem with trying it and seeing how it goes - you could also negotiate with him about different time schedules and maybe a small amount of time on his days off should it be necessary. I have no problem with the word passionate but in the end will you be happy with this person's contribution for what you are paying them. If not you need to let them go during their probation/as soon as possible. You really have nothing to lose and you probably get a well rested developer who can work hard for the 3 days. I would go for it but set boundaries and expectations - for example I would prefer to have him in full time for the first 3 weeks of every month say rather than this odd schedule.