Hi Hikaro
The Container ships are quite enormous and there is an awful lot of space, there are even elevators between decks. I used to be a Lieutenant in the Royal Danish Navy so I know what you mean about cramped quarters. Presently I am working in the offshore sector on supply and anchor handling vessels, they are a lot smaller than container ships but still a lot of room to come around.
And luckily in these modern times we have satellite internet, wireless all over the ship, so I can follow the forums on eurobricks when I'm not home. And nowadays we only do 4-6 weeks on the ship and 4-6 weeks at home, when I began we were away for 3 months at a time and no satellite communication.