IP core student version ?

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The Opencore evaluation mode stops after 1 hour if the USB cable is unplugged from the FPGA. But if you keep it plugged it will work indefinitely.

As for the prices, you will have to ask the company itself (this core isn't directly sold by Altera).

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but if I create without the core, how can I save it into my flash there in the board ?

directly from the programmer in Quartus ? select the chip name only ?

because I can't save on my EP2C8Q208 but I can save on EPCS16...

Thank you...