Range is 8100 NM. That would allow reaching Cuba from the North Pacific, let alone Nicaragua. May even be able to reach Venezuela.
That crew would be worn out by the time they got to CONUS. Longest flight I ever did was non-stop Cairo-JFK. It took 12 hours and I was just sitting there. But occasionally I could get up and stretch my legs, or sit back down and watch a movie. I’ll bet those Tu-95s are not built for crew comfort. I’ve never been on a B-52, but I’ve got some time in C-141s and C-130s, and they sure aren’t built for PAX comfort.