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

# Answer

30
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
30
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?
train