How long can you travel without getting tired?

Two days i have to be continued travelling with laptop and mobile .travelling is my passion...........

My longest plane ride was 14 hours, London to Hong Kong and Singapore to London. My longest trip by train was Cairns to Brisbane 36 hours. I haven't been on a ferry for longer than an overnight trip. I have spent a night on a bus twice, Vilnius to Tallinn and Triese to Dubrovnik. I would love to spend one week on a train going from Moscow to Beijing. It would be a superb adventure. When I go from my home country to Australia or New Zealand I like to plan some stopovers. It is a way to see more places in the world. Possibilities are Singapore which I have been to three times, Hong Kong I have been to once and Los Angeles which I have been to three times. I have been able to stop off in the South Pacific Islands like Fiji, French Polynesia, the Cook Islands and Samoa.

The longest I've travelled is for 6 weeks (with a two day break at home, for repacking and leaving some stuff), I could have travelled on after that, definitly. If I'm travelling for more than 4-5 days I'll usually plan to have at least half a day unplanned so to say, so that I can just hang out in a cafe, write post cards, check emails etc and calm down. I can get tired and fed up when doing the actual travelling here and there, especially if it's something that makes me travel-sick. Which is basically everything except horses :-)

I have never travelled for longer than 4 or 5 weeks at one time, so it is hard to say really, but I suppose I could travel until I get home sick. Maybe for a year or so? But this is all speculation, since I haven't actually tried this.