Upvote:2
I have gotten several multiple-entry and single-entry visa over the last years. It works as follows:
Both visa types have a start & expiry date. With a multiple entry visa, you can enter and exit as often as you like within the timeframe. If you get a single-entry visa, you can enter anytime within the timeframe, and when you do so, a stamp with the immigration date will be placed on the visa to invalidate it. Then you can only exit the country. If you try to re-enter, that visa will not be valid anymore.
Therefore, you will either have to get a multiple entry visa or several single entry visa.