I received the answer of my question in WR forum. 3240582 / We can correct the mistake in several ways: Insert the word "and" : We are only a few years from what has been called "personalized medicine", and that is the time when individual DNA sequences will be cheaply and readily available . Change the comma to a semi-colon : We are only a few years from what has been called "personalized medicine"; that is the time when individual DNA sequences will be cheaply and readily available .
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sb70012B. when it is a time"when" is a reference to time. It means "at the time that".
sb70012When it's the time to eat lunchNo. There's is no "the" in that expression.