Dolores Cannon says we are in 5D already

[Infinite]

I recalled Ra mentioning that there are 3 space and 3 time "dimensions" but i can't find the exact reference.

It was not Ra, but Hatonn through Don channeling. Here the link: https://llresearch.org/transcripts/issue..._0800.aspx.

And although I don't recall Ra actually saying it, I believe that all densities have 3 space and 3 time "dimensions" because all densities exist in space/time and time/space. 

Actually Hatonn said "There are six spaces and six times in each density."

As I said above, I see time and space as inseparable. For this reason I preffer use the term "dimension" to the sub-densities/planes of each density. In this view, the dimensions are infinite as Ra said.

An interesting detail is the description of astral clairvoyance given by Charles Webtster Leadbter, one of the most famous theosophists. Like me, he believed that the astral plane is the fourth dimension, and he noticed that when visualizing an object with astral vision a new dimension is added, it is like seeing all sides at the same time. He also said that the tesseract, the hypothetical fourth-dimensional cube, is a figure on the astral plane.

Here are excerpts from the book "Clairvoyance", written in 1899:

Time is not in reality the fourth dimension at all; yet to look at it for the moment from that point of view is some slight help towards grasping the ungraspable. Suppose that we hold a wooden cone at right angles to a sheet of paper, and slowly push it through its point first. A microbe living on the surface of that sheet of paper, and having no power of conceiving anything outside of that surface, could not only never see the cone as a whole, but could form no sort of conception of such a body at all. All that he would see would be the sudden appearance of a tiny circle, which would gradually and mysteriously grow larger and larger until it vanished from his world as suddenly and incomprehensibly as it had come into it.

Here we have at once the keynote, the principal factor of the change; the man is looking at everything from an absolutely new point of view, entirely outside of anything that he has ever imagined before. He has no longer the slightest difficulty in reading any page in a closed book, because he is not now looking at it through all the other pages before it or behind it, but is looking straight down upon it as though it were the only page to be seen. The depth at which a vein of metal or of coal may lie is no longer a barrier to his sight of it, because he is not now looking through the intervening depth of earth at all. The thickness of a wall, or the number of walls intervening between the observer and the object, would make a great deal of difference to the clearness of the etheric sight; they would make no difference whatever to the astral sight, because on the astral plane they would not intervene between the observer and the object. Of course that sounds paradoxical and impossible, and it is quite inexplicable to a mind not specially trained to grasp the idea; yet it is none the less absolutely true.

This carries us straight into the middle of the much-vexed question of the fourth dimension - a question of the deepest interest, though one that we cannot pretend to discuss in the space at our disposal. Those who wish to study it as it deserves are recommended to begin with Mr.C.H.Hinton's Scientific Romances or Dr.A.T.Schofield's Another World, and then follow on with the former author's larger work, A New Era of Thought. Mr. Hinton not only claims to be able himself to grasp mentally some of the simpler fourth dimensional figures, but also states that anyone who will take the trouble to follow out his directions may with perseverance acquire that mental grasp likewise. I am not certain that the power to do this is within the reach of everyone, as he thinks, for it appears to me to require considerable mathematical ability; but I can at any rate bear witness that he tesseract or fourth-dimensional cube which he describes is a  reality, for it is quite a familiar figure upon the astral plane.