Final answer:
The nurse should wait for 30 minutes before taking the client's oral temperature.
Step-by-step explanation:
When a client has just had ice chips, it can significantly lower their oral temperature. Therefore, in this scenario, the nurse should wait for 30 minutes before taking the temperature. This will allow the client's oral temperature to return to a normal level. It is important to ensure an accurate reading to make informed decisions about the client's health.