Can we ask for things to slow down and would this be safe and helpful?

You can get some dilation of time and specifically to facilitate the greater enjoyment and greater productivity in having literally more time to work with to accomplish something you desire to do. This can be gifted by request to the divine realm. It will be a function of belief as to what is experienced but keep in mind it will be subjective always and because you are in the experience, may not seem different or unusual because you are embedded in it and not able to observe it independently at the same time and notice a difference from the ordinary experiencing. So while it has practical value, it may not have recreational value in terms of enhanced enjoyment.