How much time x How long

[Marco Moreira]

Is it correct when I ask someone, for example:
Q:How much time did you stay there?
A: I stayed there for a year.

how about:
Q:How long did you stay there?
A: I stayed there for a year.

Do native speakers use both questions? In the first question, is there any grammar mistake asking "how much time"?

[bhaisahab]

Is it correct when I ask someone, for example:
Q:How much time did you stay there?
A: I stayed there for a year.

how about:
Q:How long did you stay there?
A: I stayed there for a year.

Do native speakers use both questions? In the first question, is there any grammar mistake asking "how much time"?

The first one is not natural. It's fine grammatically, though.

[Barb_D]

If you changed "stay" to "spend" it would work.