Hi Maya, I noticed that your would like to request that this particular catering service be stationed at a place for a term. So, I thought it would be more direct to ask: "Will you be able to provide your catering service in XXX for a term?" Hope this helps you. Cheers, Lance

It is also possible to write the sentence unabbreviated, with "for" as either the first (better) or last word. You can say "I'll be here (for) two weeks. And "(For) how long will you be here?". The "for" is often omitted but always understood. Formally speaking, "For" should start your sentence.

Pretty much correct, but to be more specific, you may say "how long will you be staying here?"