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I'll do another one with that. I got tired after doing that big one. I did a cursory look and /po/ probably has threads go longer without replies.
So far it looks like they might all count depending upon how you define a slow board.
/t/ has the most old threads, 11 are over a year old, 59 are not a year old but older than 100 days. 70 total.
/i/ has the oldest threads, but only 5 are over a year old and 27 are not a year old but older than 100 days. 32 total.
/po/ has 2 threads older than a year, 41 are not a year old but above 100 days. 43 total. Might have the slowest posting rate.