As an aside, may I say that my personal belief is that those who thoroughly believe that there is no God, based on their examination of three-dimensional space and one-dimensional time, are essentially cheating themselves of the sense of wonder, by so limiting themselves. (As an analogy, suppose all that you could ever perceive of someone was a photograph, and you turned down the possibility of meeting her or him because a flat black and white thing that doesn't make any noise can't be very interesting, now can it?)
We know that Heaven transcends time, because of the promise of eternal life God Who resides there. And yet there must be some sort of time, because there is music in Heaven. Music is melody and harmony in time. The Prophet Isaiah spoke of the angelic host singing "Holy, holy, holy". So there must be a sort of time, or else there would just an unchanging musical tone.
Things I think about!
As I've heard some state when speaking about the chorus of "holy, holy, holy", it will be in response to each movement of and revelation from, the Lord. Everyone witnessing such, angels included, can hardly contain themselves from crying out "holy!".
I've been blessed to have briefly experienced this very thing in the first person. No, I wasn't necessarily "transported to heaven" or some-such (for those out there who will not be able to help themselves from leaping towards conclusions) but had simply asked to be shown about an aspect of Him.
I was quite surprised to have been answered, shown in the spirit/given revelation quite immediately. I did not at that time cry out loud, "holy!" but it took some effort to stay outwardly quiet, and not blurt out that particular adjective.
The river of grace proceeding from beneath the throne, is all that the book alludes it to be and more. Words cannot adequately describe..."holy" will have to do, for now.
>>how many dimensions of time are there?
Time is just a progression of state-change. So the answer to your question would be dependent upon the states, and state changes, present in those other (alleged) dimensions.
Personally, I think the manufacture of additional dimensions is a mathematical crutch which props up a framework of knowledge that’s missing a critical component - understanding the nature of Space itself.