How much time for accepting a new survivor?

If i pull a survivor from a radio call, how long can i wait to accept him? Is there a limit? Or is it unlimited? Cannot use radio calls until i accept, but is there a another restriction?

Thanks in advance!
Very proud first officer of "<a hred="http://forums.nextgames.com/walkingdead/discussion/27/dead-angels#latest">Dead Angels</a>"

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