Sent someone a message on Facebook, what is a reasonable amount of time to wait?

Update: Please omit the question that is posted above, instead please look at this one. I sent someone a message on Facebook asking them a question and I have a somewhat of a deadline, how long should I wait before I asked them did they get my message or consider them not responding for a comment? In other words what is... show more Please omit the question that is posted above, instead please look at this one.

I sent someone a message on Facebook asking them a question and I have a somewhat of a deadline, how long should I wait before I asked them did they get my message or consider them not responding for a comment? In other words what is a reasonable amount of time should I wait?
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