Hmm but why is 60hz better then 120hz, how that is connected with game mechanics in a first place?? I bought sim on XBOX/Msoft store but playing on PC.
Is it a bug or what?
Yes, tried for first time running Xbox x at 60hz and now had three flights where there has been no time loss. This change from 120hz seems to have sorted it, and I can’t see any visual degradation as a consequence. Why would change to 60hz solve the clock issue and should I expect to see some visual performance issues as a result?
According to the theory of relativity the measurement of time changes based on the relative motion of the devices measuring it.
Ergo, it is entirely authentic that your aircraft’s chronometer would appear to lose time over the course of your flight, compared with the clock that is sitting stationary** on your desk at home. 
** In point of fact, neither you nor your clock are truly stationary, because you are simultaneously spinning around the earth’s axis and hurtling across the universe. But I’m simplifying here…
The fact that Asobo had the vision to replicate this time dilation in MSFS is commendable 
- even if some of us on these forums may debate the decision to prioritise it ahead of other features of the sim.
Unless you were flying westward, that is, in which case it sounds like a bug to me…
Learn more: Hafele–Keating experiment - Wikipedia
Pmdg 777f time slow too
Hello there from Italy. First off, thanks for this excellent discussion that all you guys have put together: you are helping a lot of people, including me of course!
I fly with FS2020 (latest updates installed) on Xbox\x.
As my TV (Sony Bravia) allows me to, I have set the xbox to 4K-120hz-VRR on-HDR auto on and in FS HDR10 on. Additionally: no multiplayer, live weather, real time.
I discovered only recently the chance to set my TV\xbox at the listed setting. Until now I have set at 4K-60hz.
The two aircraft I use is Honda Jet and PMDG 737/800. No words needed for the HJ420 as for fluidity but I was scared about the 738 which is fantastic to say the least and thought it couldn’t work on something like the xbox. Instead, it works unbeliveably perfect.
I must say that the 4K-120hz-VRR setting lets me move around the cockpit with the mouse in such a fluid and fast movement making the experience really pleasent.
Now to the clock thing…at 4K-120hz-VRR the watch is very slow and looses minutes and minutes. In addition it seems that the 737 sim flows normally independently from the watch. To explain: the fuel consumption stays, so to say, in normal time while the flight lasts longer. This bring the fuel calculation to be wrong because I arrive at the destination airport with low fuel warning despite thefuel inputs in the FMC as per Simbrief data.
Today I wanted to check the watch while at the gate with just ground power attached: the watch behaved as in flight: abnormally slow. Departing I saw that the yoke input became so slow and the 737 seemed flying at a much lower sim rate. While in flight i raised the sim rate and is was going better even though a bit too fast.
My conclusion is that it is not a xbox temperature thing as someone has said.
After that I did a flight with the HJ420 and it stayed in time loosing 3-4 minute in an hour flight.
So, it seems that the more complex the aircraft, the slower the watch.
In these days I will test the 4K at 60hz with VRR to see if this is a matter of 120 hz or of the VRR.
Conclusion: the clock thing has never been solved. Is there realisticly hope?
thanks guys…
p.s.: interestlingly the deault time setting in the weather tab of my sim was not in the real time setting
EDIT as of 14th may
Did an additional test with the PMDG 737 which is, in my hangar, the most complicated aircraft.
I read the post, in the forum, about the 120 vs 60 hz refresh. The huge clock slowing thing happens with 4k/120 hz/VRR on. The recent test I did was with 4k/60hz/VRR on and it was almast perfect with barely no differences between my clock and the 737 one. At the end of the flight, about 1 and a half hour, there was only some minutes less in the 737 clock compared to the real time.
So even though the clock couldn’t be 100% precise, the simulation ran smoothly. With the 120hz setting at takeoff I had some moment of huge stuttering making flying impossible.
The clock thing is a critical one and should be investigated again, at least in fs2020. In fact the problem doesn’t affect only the fluidity of the flying but the flight parameters as well. What happens is that there are two times flow: one of the aircraft and one of the wolrd outside. This can be seen by the fuel consumption: I calculate block fuel and reserve with Simbrief but I land with the low fuel warning.
This doesn’t happen with the 60hz set.
Hope this helps all the guys which are investigating the matter.
Regards, Michael
Going back to 2020 on Xbox as 24 is a mess right now, I couldn’t figure out why time was running so slow. I then found this thread and remembered I got a new monitor back in January and set the refresh rate to 120hz. Hadn’t flown on 2020 since getting my monitor. Set the refresh rate back to 60hz and all is fine again and time is back to normal. 