the opposite of missing time.

i've read a lot of people's experiences with missing time...where more time has passed than what they think. has anyone else ever experienced the opposite of that? where less time has passed than they think? it happens to me fairly frequently. and its never anything big, like, hours or anything. but its enough to notice. i tend to be a creature of habit, and i know exactly how long it takes me to do the mundane tasks i do everyday. so when i do an activity that takes me 10-20 minutes to do everyday, and the clock says only 2 minutes has passed, and i wasnt rushing or doing things any quicker than normal...i notice. or when i do something that i know takes at least a half an hour, and only 5-10 mins passed, ...i notice. its almost like little time slips or something. either way, its kinda weird, but i figure im probably not the only one, right? so does anyone else have these experiences?