It has no shape. Time is an emergent phenomenon, not a fundamental one. I'd like to think that with a black hole, there is a big bang happening on the other side. T = |e|
When you think about it, there are two instances where time ceases (relatively), and both involve energy. At absolute zero, all energy is removed from what I'll call the observer. With no energy, no molecular motion, time is infinite for the observer. This is the concept behind cryogenics. The other time is, say, theoretically, the observer possesses all energy, and the rest of the world appears to be stopped for the observer. So, the observer now has all the energy, but no time, as he would simply seem to disappear to the rest of the world, as he will have spent the entirety of the rest of his existence in a singularity of time.
granted, my knowledge of mathematical concepts may be flawed, so the absolute value term may not be the correct term for what I'm thinking.