as for #1 i have seen people say they had a 5 day dream (it was a good topic but lots of room for error) but i have also seen people say 10 seconds is 10 seconds so it is different for every body

#2 you will wake up trust me

#3 if you are ever worryed vocal camands have been said to work well

#4 could happen but only on the weak minded and if it dose which i have never seen happen stop doing it, take a break from ld and dv

depersonalization did you look that up because i had to