What, in the context of time, is the equivalent of "equidistant"

Both equitemporal (which Zairja mentioned) and isochronal, “... having equal duration” might work. Google shows about 475 times as many web instances of isochronal as of equitemporal (2.4M vs 5K). Also consider isochronous, in its sense “happening at the same time; isochronal”.

Edit: The word that occurred to me immediately upon reading the question is isochronic: “performed in equal times; said of motions and vibrations occurring at the same time and being equal in duration”. Another interesting word is isochron, which (in much the same sense as in isochron dating) means “an imaginary line or a line on a chart connecting points at which an event occurs simultaneously or which represents the same time or time difference”. Another sense (as used in phrase isochronic tones) is “regular beats of a single tone used for brainwave entrainment”, a sense that accounts for the trade name Isochron for vasodilator drug isosorbide dinitrate.

I came here with the same question, but I've realized that I had forgotten that 'equidistant' does not necessarily refer to linear space. For example, I remember reading a 1920s book that stated that two parties were "equidistant from compromise." So, like others said years ago, there is no single word for this, but that is because society has accepted linear space as the default frame for the use of 'equidistant,' so saying something is 'physically equidistant' just isn't necessary. To change that default frame, you could say that something is 'temporally equidistant.' For example, "Noon is temporally equidistant from 11 AM and 1 PM" or "The journeys from New York City to Washington and Boston are temporally equidistant." A quick Google search indicates that the phrase is fairly common in physics and philosophy papers.