How do black hole properties change with added mass?

Question

How do the spin, lifespan, radiation, gravity, and relativistic effects (time dilation in relation to proximity) change as you start from minimal mass to more massive black holes (not limited to the mass realistically possible, but limited by how far our equations can go before breaking (since I want to avoid hypotheticals (though feel free to point out any leading theories if you want)))?

Rd Basha · Accepted Answer

The equations of GR do not "break" at some value of a black hole mass.

Spin: A black hole of any mass can have spin bounded by: $J^2 /M^2 + Q^2 leq M^2$
Lifetime: A larger black hole would have larger lifetime. The mass is lost by Hawking radiation. More massive black holes (of the same angular momentum and charge) have lower temperatures.
Gravity/ Relativity: Im not sure what you mean. More massive black holes have stronger gravitaional fields around them.

How do black hole properties change with added mass?

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