Well Memory Alpha claims that 'Gambit" has the longest, with like 70 shots, or something. Imagine if each shot takes the producers 5 hours to produce, that's a lot.
I suspect that MA did not really update this statistic, aside from simple reciting the original fact as stated in the TNG Companion. So which episode has the longest phaser fight with the most shots fired on screen? There are a lot of good choices from ENT, such As Rajiin, Twilight, and other Xindi episodes. But for some reason I think the winner has to be the last act of "Seige of AR-558"
I suspect that MA did not really update this statistic, aside from simple reciting the original fact as stated in the TNG Companion. So which episode has the longest phaser fight with the most shots fired on screen? There are a lot of good choices from ENT, such As Rajiin, Twilight, and other Xindi episodes. But for some reason I think the winner has to be the last act of "Seige of AR-558"