I don't have two long distance relationships,but I do have one plus one local, and it does have its challenges.
In a way, it would be easier to have two long distance relationships because then I could scedule them both sort of the same. The challenge in having one CD and one LD relationiship is that the keeping up of one relationship is always spilling into the other.
I have done international travelling for almost two years and it gets tiring - and expensive At the same time it is also a blessing, for all the new experiences that I get, with language, people, nature, music and food.
I notice that your other parthers also have partners and kids, and you also have kids, and I imagine that may be even more challenging than the distance. While all of us work and work scemes may inflict on travel, the only one that has to be looked after is our cat. If we do get kids, it will be connected to all of us so the sceme of that would be different.
My challenges with long distance travel as of now, is that I completely feel like I live in two places - the home I bought with my husband, and the flat I rent with my boyfriend. I am also in a long distance relationship with my cat. I am completly emotional just seeing the cat on Skype... Time management can be demanding. I work, and work out, and have to sleep tooo.... It is hard to keep up with friendships and such because most days I want to connect with both of my men.
Holidays are always a challenge, luckily my husband can travel with me to my boyfriend some of the time, but we simply don't always get vacation at the same time (I have to take out my vacation when the centre I work at close, my husband usually have holiday time that partly overlaps mine, boyfriend works season and does not have a holiday, just off time in the fall/winter time, so most of the time when I visit him he works long hours every single day).
Also money is a huge challenge in plural relationships, what I do with one of them inflict on the other - like i spend a lot of money visiting my boyfriend and renting a flat with him, which leaves little for my husband and I to enjoy ourselves at dates. At the same time, recently me and husband sold our old flat and bought a new one, new furiture etc, which meant I had to skip visiting my boyfriend's mum, which I was very unhappy about, and we invested a lot of the money we earned in deleting some loans and invested in the new flat - but then again we will have more space and furniture for when boyfriend hopefully comes to live with us at least a couple of months next year.