I am not capable of choosing topic unless being provided with one. Can you please provide me with the topic so that I can write an article on it?

Can I cancel this promotion at any time?

I do not have information about which promotion you are referring to. However, many promotions have terms and conditions that outline the cancellation policy. It is important to review the terms and conditions of the promotion to determine if it can be canceled and what the process is for canceling.

How long is this promotion valid for?

I don't have access to the specific promotion you are referring to. Please provide more details about the promotion so that I can assist you better.