Is vipassana outside a ten day retreat possible? Traditionally Vipassana meditation is taught in a 10 day retreat. I have been trying to participate in one of those, but there is only one place where I live that offers this course, it is almost always fully booked, so it is very hard to match their availability with mine as I work pretty hard. 

I have been practicing meditation for some time (different types) and went to a retreat in Asia, but I never had the chance to practice Vipassana in a traditional course.

I will keep trying to join the retreat, because this is important for me, but in the meantime is there anything one could try at home? Some glimpse of Vipassana perhaps?
This is possible but anything less than 10 days for you 1st sitting may not give you visible results for an average novice. Also anything shorter may not have the critical push to give results. This is the reason the courses are organised in such away.

Also some continuity or length of practice takes you deeper and give better results. Just when you practice playing a game, more frequently you do it better you become.