Or work as contractor / part-time.

I've had two experiences with people like that:

- At one place I've worked at (big corp), the QA department was full of contractors. One of the contractors was only working 9 months per year - they spent all summers in Australia. Everyone knew about that and accepted this. The contractor was great, and no one had problems with that (I am sure not having to pay them anything while they were away helped :) )

- At other place, a small startup, we had a team member who was in a band. He'd work for us for a few months, help us to finish a project and make sure customer is happy.. and then disappear for a few more months to tour the US. Again, he was a great programmer, and we always welcomed him back.

I am sure that not every place is like this (for example my current workplace is pretty bureaucratic and would not be happy with this arrangement), but things like this definitely exist.