The actual travel time is minimal. I think the bus ride from CSR-Studios is roughly 5-6 minutes and it would be another 5 or 6 to get from the Studios to POP. It's just that you could be waiting a bit for your bus to arrive. I personally would be waiting for the bus at CSR about 40 minutes before you want to be at POP. But if you're lucky, the whole trip could take 15 minutes.
Another option would be to take a cab. That would be the quickest and shouldn't cost too much.