Is it normal i dont think about anything most of the time?

Most of the time i dont think of anything in my brain. I stare at random things while i dont think about anything. At first it was like only for a moment or up to a few minutes but now i it can go up to hour or two. And i am aware of that i am not thinking of anything and it seem to be more relaxing and difficult to come back to the "thinking" state. It is much easies to just pass my time thinking about nothing and staring in the mid air. This must be called spaced out right? Now i have been doing this at work and it is difficult to concentrate on the think i have to do at work . And But when my friends ask me what i have done on a off day i cant say i have spaced out sitting on my chair. i just lie to them and say i watched movies was doing something on my computer. Now i am do get aware of that i am not thinking about anything when i am "spaced out", but then i saw why bother thinking. You could say cus i dont have anything to do i do this and that makes sense, but at work i dont do this intentionally.