How can I get the most out of my advisor's knowledge if s/he's always travelling and out of office?
We communicate by email, but I find it uncomfortable as I am new to the field I am working in and sometimes questions/answers are not very clear.
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The goals here are to ensure that you get what you need as conveniently as possible for your advisor and as quickly as possible for you.
I had some success via sharing a git repository with the LaTeX source to the thesis-in-progress, with a branch in which I added commits for my suggestions to be cherry picked or not by the advisee). Students recorded daily (or so) progress reports in a wiki, which I looked over from time to time.
In a time previous to git, we interacted via email (I printed out a copy, and sent a detailed email with suggestions).
The above requires more or less independent work by the student, and is hard on discussing alternative courses of action, or techniques to apply, brainstorming, whatever. So this works best when the thesis work is nearly done.
Note that someone who is permanently on the move probably has their hands full with both the job to be done at the current location (if you the superstar invited for a week, they'll fill your agenda to the brim to make the most of the visit, and invite you to all sort of social activities "so you don't get bored" and to show off with the visiting dignitary), handling domestic issues far from home, and assorted travel-related activities. I.e., they will have precious little time available to guide advisees, and thus will probably make terrible advisors.