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!
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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Comments
But honestly I never thought about it...
http://forums.nextgames.com/walkingdead/discussion/comment/17693/#Comment_17693
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But the game being random in all kinds of way I don't say zbot is wrong. If it's a survivor you want, don't risk it too much.