That's a weak excuse considering in both, the books and game he 100% knew Ciri was in danger.
But this isn't the point as urgency in games and books works different.
Every single romance is optional. So if your Geralt wouldn't want to "waste" his time, he wouldn't and let's not pretend that sleeping with someone would cost him that much time. No more than doing Witcher contract number 20, althought he doesn't need the coin anymore or helping the pan women to check her house for no reason.
Almost nothing of the sidesstuff Geralt can do,helps him to find Ciri and yet he get's the opportunity to do it. It would be the same with more romances.
Not even mentioning that there is a time with no urgency after Geralt finds Ciri und she is in no danger.
I never said that, it's you own interpretation