Obviously, a lot of kilometers. When we proposed the plan to klik's parents, their reaction was: "We're in, but good luck getting Grandma to agree!" Apparently she feels she is imposing too much on others with things like travel -- or something like that.
Grandma is 94, and is still living on her own. In a flat on the first floor -- without an elevator. One time when we went to visit her, she was complaining she had to take two different types of medicine every day. I know people my age who take more medicines, but hey.
Anyway, I called her. She has a soft spot for me, apparently, because she readily agreed to go along with the plan. She did object that we would have to travel a lot, but I countered that it would be fun! Other than that, she was all in favor.
klik's mother has threatened to use me to get grandma to go along with her plans.