No I don't think it's too much time as I'm more focused on the end result than the time involved. I suspect that each individual will reach a point, in terms of speed, that they can't do it faster and still have a respectible result.
The icing on the cake is having the cellophane on the deck when done. Still working on that aspect as well.
So far, when I talk to people about this they say something like, "No big deal, you just take all the cards out, put the box in the bottle and put the cards back in." However, they stammer when asked about the details - then when you show an example of the deck sealed in cellophane still in place ----- they no longer have much, if anything, to say. I think that is a great reward for being able to get the deck into the bottle.