I was never going to travel in retirement. Work always involved a reasonable amount of domestic travel, and I hated it. So I never planned a budget for it. However, I was always going to travel around Australia a bit. And I was always going to Turkey last year (that has had a budget for many years). Like spartana, travel is at least half my expenses. Most trips cost less than I spend when I am at home, but the international ones have a habit of being a bit more expensive.
And travel often seems to get a bit out of hand. For instance, I am going to Canada soon. Of course, the Inner Passage was one thing on the list to do there. Then I realised that part of the Inner passage is Alaska, and I found that I could hire a small RV and take it to Anchorage for cheap (because I am relocating it for the season). So I am driving up and boating down. Then I told my mother that I am somewhat dubious about driving an RV, since I have never driven one before especially as I will be driving it on the wrong side of the road. She suggested hiring one for a weekend here. So I looked around, and found that I could get one for $5 a day, if I drove it from Sydney to Alice Springs (of course I am going to Uluru and Kata Tjuta - which I have never seen before except from the air). And now I have realised that Lake Eyre is filling again (Australia's largest lake, but it is not in Wikipedia in the list of the world's largest lakes because they say it only fills once in a hundred years - even though it has filled about 5 times so far this century already), so I could see that on the way, as I will be driving reasonably close by. And while I was looking at that I discovered the Anna Creek Painted Hills (which I could see when I see Lake Eyre) which are MUCH better than the painted desert in the US if the pictures are anything to go by...
I seem to be averaging at least 8 + 8 + 8 = 24 weeks a year traveling. More last year.