zoossh, good that you brought this topic up.
Been playing on my mind quite a bit
If I had my way, I would work 3 months in a country, explore the next 3 months. Then move on to the next country. Unfortunately, work permit and immigration rules don't allow for such an option to be implemented very easily.
If I combine travelling with photography, I would rather be interested in focussed travel. Every place on earth (and elsewhere in this creation too) is beautiful. But there are times when it turns that extra beautiful - if you get what I mean.
eg. I spent two weeks in Northern Xinjiang in June/July 2006. It was beautiful. But it really turns super beautiful in autumn (and in winter). If I was going on a photography trip, I would choose the best time to be at a place (then again, "Man proposes. God disposes". So many of my "focussed" photography travels have been washed out :bsmilie
If I was going to witness an eclipse, I would choose a place that would offer the best conditions and travel in that region (like Myanmar happened this year - the reason was the Annular eclipse, but I had a super duper time of my life travelling in Myanmar)...
Sorry, if I digress.
But the point I was trying to make is that, if its just travelling from one place to another, I could do all life long, working along the way. I have been a nomad anyways...
However, since I don't have any savings and neither do I have a steady income if I don't work, then I guess 1-2 years is tops...
If its focussed photography trips, and if you are not already a multi-millionaire, then you need to get back to earn for that next trip (and the "home" country is the only place that would offer you that chance).
Cheers
[and good luck on that Ethiopia trip]