If Enterprise went the full Seven seasons Should there have been time gaps during each season?
(I.E. Seasons 5 Episodes 1-13 would be 2155 14-26 (or however many episodes they would've done) would've covered 2156; time jump; Season 6 1-13 would be 2157 and 14-26 (or ????) would be 2158 and Season 7 would cover 2159-2160. That way you get all four years of the Romulan War covered.
They wouldn’t need to do like that. The miniarc format from S4 meant they could have focused on one major battle for a year and its effects.
S5 would cover 2155 – 2156. The entire build up to the war. Plus, some mirror universe episodes.
Then S6 could be like this…
2156 – Battle of Vega
2157 – (Second) Battle of Altair VI
2158 – Battle of Alpha Centauri
2159 – let’s say this is the Battle of Sol, as the Star Trek: The Beginning script planned. Could also be a (Third) Battle of Deneva happening concurrently
2160 - would clearly be the Battle of Cheron and the negotiations of the Cheron Accords
Three episodes each is fifteen episodes total. That leaves at least seven episodes to be standalones that can develop the crew in between the battles. Or simply explore and make discoveries (ex. Algeron, Galorndon Core), or make first contacts. Or discover ancient artifacts from extinct species. Or search for a lost Coalition of Planet starship. Or be on missions of mercy. They could even have an arc that’s a throwback to the original concept of Voyager and they are struggling to survive (not the piracy stuff from S3, but something different and more desperate that would lead to mutiny). And at least a couple of those episodes could/would deal with the signing of the Federation Charter for the S6 finale.
Then S7 would deal with the early years of the Federation, right up to the first graduating class of Starfleet Academy, the creation of General Order One, and Admiral Archer becoming Ambassador to Andoria. That would be 2-3 episodes per year, from 2161 through 2169.