You would think very fast, since their gravity is so strong. However, the closer to a black hole something gets, the more warped is the spacetime. Time appears very slow near a black hole, so the question is does it take a really long time to suck summat up?
Black holes. They can be so large that they can suck up universes at a time
yes they can. black holes "suck" in all matter including light but they can only "suck" in things that pass the event horizon everything else is safe
yes
Yes, all black holes 'suck stuff up'.
Yes
yes but not likely
Yes.
nobody actually knows but scientist think that they are doing nothing just standing there waiting to suck something in
Black holes don't in fact 'suck in' anything; I know you are using the word as a figure of speech. The gravity of a black hole is so strong that if an electric current, or something conducting an electric current, goes below the event horizon, the electricity will not escape. There is some evidence suggesting that black holes do decay over vast time periods. Currently, even the absorption of the background radiation is more than enough to compensate for any decay that is happening in most large black holes.
Black holes were stars that were so massive that they collapsed on itself. The gravity in black holes is infinite and more you get closer to it, more time gets slower. Black holes suck all matter that is too close. Even light can't escape Black holes.
You can't because they suck in light, there for you cannot see them
Absolutely anything and everything. They may even suck up time(!!!!!), but no one knows for sure.