Our internship program is 10-12 weeks long. Are you able to commit to 10-12 weeks with us?

Let the hiring manager know that you are aware of the length of the internship and are prepared to commit to 10-12 weeks. They want to see that they will not invest time and money in a candidate who then decides to leave partway through.

If you cannot commit to a 10-12 week internship, avoid telling the hiring manager that you can. You want to respect the company's time and investment it takes to hire and train interns.

"Yes, I understand the time commitment, and I am prepared to spend 10-12 weeks on this internship with your company if you choose me."