From the product guide:
Non-Commercial Use. You may install and use the Software for non-Commercial Use on up to three (3) computers for each license that You have purchased.
Commercial Use. You may install and use the Software on a number of computers equal to the number of licenses purchased. Installing and running a single license of the Software on multiple computers is prohibited even if the computers are not running the Software concurrently. Concurrent use of the Software by multiple users on a single computer is prohibited.
So, if you're doing it for your own non-commercial reasons, you're fine.
If you're doing it as a part of your job, you can only run 1 installation at a time using a single license.
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Michael Roy - PM/PMM: Fusion & Workstation
