Newbie question: Quartus Web Edition, Altera IP?

First if you have any license installed, it will show up in Tools > License Setup. The version column should tell you when the corresponding license will expire (although Licenses never expire, but I never fully understood how to make the difference).

Then if you compile a project with an unlicensed IP (or an IP with an expired license), you will see that the compiled image is placed in a file ending with _time_limited.sof instead of the regular .sof. You will also get a warning message each time you configure the FPGA, so it's hard to miss ;)

In that case you can still run your design on the FPGA, but in evaluation mode. The USB blaster needs to be connected to the FPGA for as long as you want to run your test, and you wonæt be able to flash your project.