Is this sentence correct?
The man died in less than a month since the start of his fast.
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The man died in less than a month since the start of his fast.
No, it's incorrect. It should be something like this:
The man died less than a month from the start of his fast.
You can say:
It's been less than a month since he began his fast, but he's died.
He died less than a month from the beginning of his fast.
In less than a month from the beginning of his fast, he died.
Since [time reference, not synonymous with because] he began his fast, he's had heart trouble, stomach problems, and psychological traumas.
Since is a difficult word for EFL students to use properly. This link gives some good examples of proper usage.