I'm quite fortunate in that sense, my o/s trips are generally between 3-5 days away from home, and domestics are arely more than 2days/2nights away. If i had ot be away for weeks and weeks or even months away at a time, I'd either ask for my family to join me and be looked after, or tell them its not possible.
To the OP, the other thing to bear in mind, if your partner is likely to be away for long periods, is it long periods away from home and in one spot, or long periods away from home in multiple spots? Its a subtle but important difference. If he's going to be away from home but sitll jetting about, there's probably not much point in you being away also.
From what we understand it would be in one spot, he has been told his training would be for 3-6 months in either MNL or Mid west usa (oh so very different but I guess thats where the trainers lie) and he was also told about having to be away for longer blocks but reading between the lines and the description saying 80-100% to me that means there will be a lot of shorter trips around those longer ones.
The sales guy said he travels a lot. I am not sure why my partner should need to given that he just fixes formatting in the code (in both senses) which to me can be done anywhere. But I am happy to visit for a week if he is away for a month or two. If he is away for 12 months then yes that will be harder unless I don't work.
And if I don't work then I can't retire in 10 years like I have been promised..