Dear Hugh
In social sciences, it's all about fieldwork. Writing part of the project comes later but from what I have observed from other people, they are never at the university even when they return from the field. If they have great and understanding relationship with their postdoc mentors, then it all works out. Postdocs in social Sciemce is very bizarre and as long as you send regular updates and reports from the field including publications or organise workshops or seminars, that is more important than physically being present. Thankfully, I don't have problem with the later, I have no problem organising workshops as they and really fun...