The injury would be fully healed after 3*5=<<3*5=15>>15 days

So he would start exercising again in 15+3=<<15+3=18>>18 days

He would then wait for 3*7=<<3*7=21>>21 more days to start lifting heavy again

That means he needs to wait 18+21=<<18+21=39>>39 days

# Answer

39
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
James hurt himself exercising.  The pain subsided after 3 days, but he knew that the injury would take at least 5 times that long to fully heal. After that, he wanted to wait another 3 days before he started working out again.  If he wants to wait 3 weeks after that to start lifting heavy again, how long until he can lift heavy again?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
39
James hurt himself exercising.  The pain subsided after 3 days, but he knew that the injury would take at least 5 times that long to fully heal. After that, he wanted to wait another 3 days before he started working out again.  If he wants to wait 3 weeks after that to start lifting heavy again, how long until he can lift heavy again?
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