They gave us 4x and then began making animations that look like 2x at 4x speed (play Sith Eternal's link ability at 1x speed, you can comfortably complete a 4-year degree in the time it'll take to finish the animation). We need a longer timer. CG release ridiculous, overtuned dcrons that make teams like Gungans and Inquisitors take 179 turns in a row, effectively reducing the 5 minute playtime to 2 minutes or less.
Alternatively, the clock should only count down on your turns, like in chess. But I assume that simply doubling the time limit would be easier to accomplish on the back end.
Extending the time isn't necessary for fleet battles, or even Squad Arena. Just GAC and TW, where opposing team stealing our playtime off the clock can mean a difference between a fail or a win.
Of course, CG could still just make even slower, longer animations, but changing animation speed to 6x or 8x would just lag the game even more than it does now.