Call the shops your interested in. Now you have narrowed down your list to a couple of shops. Make a visit. Ask some good questions. The general answer should be 3 months or 3,000 miles.
Oil is a chemical lubricant that breaks down with age, use, heat, etc.
Some manufacturers are saying 5 months or 5000 miles. An oil change is cheaper that an early engine failure. A good shop will want to help you. If they educate you now it makes it easier for later. Ask for the parts to be returned before the job is started.