Assume they are in a simulation—why would it have an event buffer created able to compute time travel at all, and why pick 6 human hours (equivalent) as the magic number constant for it?
It occurs that magic is basically the ability to hack the simulation; the wizards who developed time travel didn’t know what was actually safe, what was unsafe, what would crash the simulation, and what the simulation could actually even do—so they picked the weakest version of time travel to implement (both branches consistent) and slapped a bunch of arbitrary limits on it so it (hopefully) couldn’t break anything major.
Also, Merlin in T.H. White’s The Once and Future King lives his life backwards in time, from old age to youth—is that canon!Merlin, and does that property carry over to the Merlin to whom the characters refer in HP:MOR?
It occurs that magic is basically the ability to hack the simulation; the wizards who developed time travel didn’t know what was actually safe, what was unsafe, what would crash the simulation, and what the simulation could actually even do—so they picked the weakest version of time travel to implement (both branches consistent) and slapped a bunch of arbitrary limits on it so it (hopefully) couldn’t break anything major.
Also, Merlin in T.H. White’s The Once and Future King lives his life backwards in time, from old age to youth—is that canon!Merlin, and does that property carry over to the Merlin to whom the characters refer in HP:MOR?
Merlin is not in the canon except as a curse-word of sorts (By Merlin’s beard!).
And as the figure referenced by the Order of Merlin, which is awarded to people who perform exceptional deeds, and as the first person to get his face on a chocolate frog card