Used to inquire about the weather. / (by extension, idiomatic) Indicating a change of subject to unimportant topics.

(rhetorical question) A general statement of surprise or bemusement with regard to a particular event.; isn't that good, or unexpected, etc.

Used literally: what length. / Used literally: what duration.

Used literally: for what duration.

(slang) how are you?

(archaic) Hello, what is that?

(informal) how are you?

plural of how-to

How?; In what way? / (idiomatic) Why?; For what reason?

How; In what way; however / (idiomatic) Why; For what reason. / Used as an intensifier.