Lancashire played their first T20 Blast match of the season on 29 May and ended the 14-game group campaign on 18 July.
There was then a gap of 50 days to their Emirates Old Trafford clash with Kent, with seven days between that tie and Finals Day.
“You can’t have eight weeks between the last group game and the final,” said Jennings.
“There is no other competition in the world that does that. Hopefully it changes next year.”
Finals Day will be staged 57 days after the end of the group games while, in comparison, the whole of the Indian Premier League was played over a continuous 73 days, while Australia’s Big Bash was completed in 43 days and the SA20 in South Africa over just 30 days.
Dates have not been confirmed for 2026, but the ECB announced last month the T20 Blast would be completed in one block next summer before The Hundred begins.
