Is it common to use "where" after "a time" as a relative?

I heard the following comment of Mr. Marco Rubio about Mr. Donald Trump on CBS’s “Face the Nation” in a clip in February 29th AP Radio News:

“There is never gonna be a time where the Republican Party rallies around and says you have to get out or anyone has to get out for purposes of rallying around Donald Trump. Donald Trump is not Republican Conservative. Donald Trump is trying to pull off the biggest scam in American political history.”

I thought I misheard “There is never gonna be a time where –“ for “There is never gonna be a time when –“ at first, because I was in understanding that time should be trailed by “when” as a relative noun or adverb. An English Japanese dictionary at hand (Readers English Japanese Dictionary published by Kenkyusha) provides “where” singly as a relative to refer the ‘place.’

However, my lookup of the following two sources endorsed that I heard it right:

Here is what is never going to happen in this race. There's never going to be a time where the Republican Party rallies around and says you have to get out or anyone has to get out for purposes of rallying around Donald.. - Source

“Here is what is never going to happen,” Rubio continued. “There's never going to be a time where the Republican Party rallies around and says you have to get out or anyone has to ...

- Source Link

Is it common, at least not uncommon to use “where” after “time” as a relative?

Solution 1:

"Time where" is not as idiomatic as "time when", but not impossible. More broadly used noun with the relative adverb where is "period" as in:

[European Community Contract Law, Volume 1]

If you consider the "time" used in the Marco Rubio's sentence as "a block of time" which you can visualize in a timeline, there is no reason that you can't use where after time as in:

[The Practice of Cloud System Administration: Designing and ..., Volume 2]

Also, time is synonymous with instance or occurrence (Definition 3.4 in Wiktionary).

It is a safe bet to say that you can use "where" after "time" when it is synonymous with instance or situation (circumstance) as in:

There is never gonna be an instance (situation / circumstance) where the Republican Party rallies around and says you have to get out or anyone...

Solution 2:

The usage of "where" meaning "in which" referring to contexts different from a place has become commonly accepted now, as stated below by the Collins Dictionary:

Where (Usage note):

• It was formerly considered incorrect to use where as a substitute for in which after a noun which did not refer to a place or position, but this use has now become acceptable: we now have a situation where/in which no further action is needed.

The expression you noted " a time where" has become more commonly used in the recent decades:

Ngram: a time where. Ngram: a time where vs a time in which.