Term length is a trade, not a default
A longer term gives the provider certainty and sometimes buys you a better figure, particularly where they are investing in equipment or recruiting for your site. A shorter term keeps your options open and puts steady pressure on performance. Neither is right in the abstract. What matters is whether the length you are agreeing to matches how confident you are, which after one walkthrough is usually not very.
Where a provider asks for a long initial term, ask what you receive in exchange. A lower rate, a fixed price for the period or an investment in equipment are all reasonable answers. If nothing is offered in return, ask for a shorter term or a break point partway through. Most providers will accommodate that, and the reaction to the request is informative in itself.
