"Am faint o amser buoch chi 'na?"

Translation: How long were you there?

[AlanNason]

Is this form of the past used in everyday conversation?

[ibisc]

Yes, but less so in casual speech.

[AlanNason]

Diolch.

[DavidLangdon0]

Why is it "buoch" and not "fuoch"?

[ibisc]

am faint o amser...? is a simple adverbial question, so it should be followed by mae or b-forms of bod, or by unmutated forms of other verbs. Some people do mutate verbs after simple adverbial questions, but that is not strictly correct.

[DavidLangdon0]

Thanks again. That clarifies things.