How long after a show is a bootleg released?

Sorry to ask this, coz im sure its been asked a million times, but I couldnt find anything in search. Ive bought them in the past, and from memory its only a couple of weeks. Am I wrong?
3 March 1998 (Tue) - Rod Laver Arena, Melbourne
19 March 1998 (Thu) - Perth Entertainment Centre
23 February 2003 (Sun) - Burswood Dome, Perth
25 November 2006 (Sat) - Subiaco Oval, Perth
14 November 2009 (Sat) - ME Bank Stadium, Perth
2 February 2014 (Sun) - Arena Joondalup, Perth
19 March 1998 (Thu) - Perth Entertainment Centre
23 February 2003 (Sun) - Burswood Dome, Perth
25 November 2006 (Sat) - Subiaco Oval, Perth
14 November 2009 (Sat) - ME Bank Stadium, Perth
2 February 2014 (Sun) - Arena Joondalup, Perth
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euro shows were a couple of months
philly shows are tbd. we just passed the three week mark for the first pair of philly shows.
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tbd...ie we don't have a clue
yup...saw that late last week.
to be determined
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