the Software is Free.
By "the Software" you mean the part that runs on a PC; the "visualization" part. Correct?
Only the generated runtime application has the restriction of 15 minutes.
By "generated runtime application" you mean the part that runs on an Arduino. Correct?
Arduino user you can use the "light" runtime license. The driver will be ready during next month.
At this point in time, is the following accurate?
The runtime is restricted to 15 minutes for testing in the free version.
Your software is or is not open source?