Funny thing I learned, studying the EU labour law for crews. (ain't the FTLs!). The number of annual hard-OFF days is calculated to exactly match (no less) the standard business days pattern over the year.
I.e.
52 weeks in a year, four of them are vacation ----->>>>> 28 hOFF
48 weeks remaining, 2 weekends each ----->>>>> 96 hOFF
Public off days (national festivals etc, bank hols) ---->>>>> around 4 per year
= equals = 128 hard-OFF per year. That's what a labour-law worker in a standard job would get and crews need to receive too. To be delivered _AT_HOME_BASE_.
If on a standard job, you went working on Monday at 4 a.m. without seeing your family and stay the whole week on the road to return on Friday by 10 while they are asleep, you are still getting 128 (124 min) wholehearted hard days off. And it won't feel like much.
Please consider that when making up one's mind about any 120-off commuting option. It is much different from crews who LIVE WITH FAMILY (and social circle) at the base because those can enjoy more regular home time through the rostering pattern (4-2 5-3 or whatever overlayed on top of the above). BTW long-haul with rest days downroute reduces that dramatically.
But specifically for commuting... count the chickens you'd be getting..... not forgetting the travel days will be your responsibility. Every airline dispatch and HR just LOVE to have crew available at whim.