Sorry I will go ahead and respond. Sorry and the single proton or neutron could have meaningful entropy because a proton and neutron are not a single object. They are a construct of quarks and gluons so saying that they are a single entity is incorrect. The entropy could exist between the quarks and gluons. Time interacts as a dilation effect through Einstein's theory in regards to time dilation. As gravitational fields change of the velocity of the particle changes the effects of time change how it effects the particles. An example of this would be the atomic clocks on the gps satellites, the gravity is weaker so time dilation is effecting the ticks of decay of the atom. Isolated in time is essentially referring to a point of infinite energy or an infinitesimal of energy to get time to dilate to such an extreme that the seconds are infinitesimally near 0. And indeed photons have no "rest mass" however to say that they have energy is to give them mass. Einstein pointed out that energy and mass are interchangeable so in this case how would you say photons never have mass and yet are capable of carrying momentum?