If I am reading or thinking about something really mind-blowing, alternatively talking to someone who really stimulates me, I can experience great time loss.
As for just drifting away, there have been times that several hours disappeared.
I'm usually awakened by base needs.
Mightier than the tread of marching armies is the power of an idea whose time has come
I quite often don't even remember what day of the week it is. If I'm let to my own I will even forget what month it is. I guess being an INTP it makes sense that Time is very low on my priority list unless it's important for me to remember.
"What's the worst that could happen?"
"Would you like that list chronologically or alphabetically?"