“Without mass, there is no time, and that is an irreduccable fact that is understood by its definition.”
No, it isn’t. It is your assumption.
Time is a function of space. Without space, there is no time. This is a notion understood by the ancients when they used words like “eternal,” and surprisingly confirmed by modern physics.
I'll try one more time before you go into the "invincibly ignorant" catagory...
E=mc squared has been verified to at least 16 decimal places. Now if you solve for time (a factor of "c") and make mass zero, the equation goes undefined because you have a zero for your denominator. Time is a physical property just like width and length, and every encyclopedia that addresses the issue recognizes this fact.