For many years i had a great cat sitter who was wonderful with my up to 6 cats. She came twice a day for both care and play for 45 min to an hour each time. Even when a couple of the cats needed oral meds, she had no problem with that, and the cats really liked her. This was great when i had to travel several times a yr for work and once or twice for vacation, up to 10 days each time.
She has moved to another state now.
My cats are now quite old and beginning to pass away. Two died this year, one of them this past Tuesday. Both of those were 18 yrs old, one almost 19.
If I had to travel, the only way that would make sense for the 3 remaining cats (ages 16, 16, 18) is to board them at their vet. The vet has a rather large boarding area with a very large enclosure nearby with several song birds for the cats viewing pleasure and there are also floor to ceiling windows where they can view other fauna in the adjacent parkland. Cages have two section one with bedding and food, the other with litter box. One can also choose a large room for multiple cat boarding where they can see and interact with the hospital staff all day, something my very social cats, two of whom are working cats as they volunteer as therapy animals visiting mainly nursing home and hospice residents, would prefer.
Even with this option, boarding them would make my anxious as they are so used to their home routine. It is really the only option however as one needs sub Q fluids and insulin shots and other meds, and one other also needs insulin.