Wicc
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Specifying a chess timer in the seasonal rules is a PR move, not an administrative decision. That is, it doesn't obligate anyone to anything, but merely recommends it.
The following figures are most often used:
8+4+1 on M
16+6+1 on L
30+8+1 on XL (including Jeb)
Discussions and votes should be based on these figures – who wants it higher, and who wants it lower?