at/for

Either.

"At" is the much more common word, although every so often I will hear someone use "for" in this context. "At" sounds more natural, though.

Thanks, Contrex and Shapeless.

Both sound equally "natural" to me. This is such a subjective thing. When I am at work, arranging appointments for interviews, I say to the clients, "Shall I make you an appointment for 10 or 10:30?". They might tell the people at reception "I have an appoint for (or at) 10:30 with Joe Bloggs."

I set my alarm clock for 8am. Is this sentence fine? In this case 'at' cannot be used. Am I right?

Thanks.

Yes, I think it more to common to "make" appointments for but to "have" appointments at, but I have also heard it either way.

What about the question above your latest post?

Your guidance is deeply appreciated.

"For" is the better choice. I don't think I've ever heard someone say "I'll set the alarm clock at..."

Many thanks, Shapeless.