Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
John decides to get the vaccine for COVID.  He has to wait 20 minutes for the first dose.  The second dose has a wait time half as long.  How long was the total wait time?

### Response:
The second dose had a wait time of 20/2=<<20/2=10>>10 minutes
So the total wait time is 20+10=<<20+10=30>>30 minutes
#### 30