As they go the Kiss route - which I hope they do - there would be a double CD and double DVD within a year following the performance... don't know exactly how long it took Kiss to put it out - but it was within the year for sure.
Edit: I found this on a Kiss website:
Quote:
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On September 8, 2003, Sanctuary Visual Entertainment is set to unleash KISS Symphony on DVD and VHS. This spectacular one-off concert celebrates the bands' 30th Anniversary, and was filmed on 28 February 2003.
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That would be just a little of 7 months. So anything is possible.
Please do note that Sanctuary is also Meat's US label.