Question

Since a black hole slows down time so dramatically when objects cross the event horizon how is it possible for them ever to "swallow" anything? Would it not take an infinite amount of time for one "swallow" anything, or even for one to form, and even if they can form shouldn't it take forever for one to even reach a tiny mass? So how is it possible for them to become "supermassive"?

Answer 1

A) Supermassive blackholes are different..

they have SUCH huge mass, that they turn blackholes
to understand this.. you need to know a little bit about schwarzchild radius (i never get that spelling right)..
To be a blackhole, the required escape speed should be more than that of light
for that to happen, Either radius has to be VERYYYY small (for earth, peanut size)..
but if the masss is HUGGEEEEE then even at high radius you can achieve the required radius..

so they are two different things

secondly TIME Is relative.. so .. it seems to U, that it takes for ever for that person to enter the black hole, but relative to that person that is not the case, so he ll definitely enter.. (but in reality we don't know what happens once you cross the event horizon, all the current laws of physics breaks down.. even the space time fabrics seems to tear apart.. so we don't know what happens. ) its all a theory!