Part of me strongly agrees with jarbear. The 16 hour clock is even more unbelievable here than it was in TLJ, with all the planet-hopping and adventuring they do in TROS. In fact, I’m a bit surprised HAL’s edit of TLJ kept it.
On the other hand, while TLJ had the “relentlessly chased and running out of fuel” plot to make a specific timer unnecessary for a sense of urgency, the clock in TROS is really the only thing providing urgency in a very rushed story. The characters are constantly running from one place to another, and then in the finale they all rush to Exegol without any guarantee of backup. Without the clock, why would Rey not return to Ajan Kloss, the Resistance wait until they get more help, and then launch a more coordinated assault? The destruction of Kijimi could also provide this sense of urgency, at least in the end, but then you have to ask “would I rather have a single line saying there’s a clock, or the entire subplot of Palpatine having 10,000 Death Stars?,” and I think most will say they’d prefer the clock.