Dave wrote:

My maytag gas oven is taking longer to pre-heat. What do I check?

You need a new ignitor, such as the one shown here in the thumbhail pic. Click it to git it, install it and you’re good to go. Slam dunk.

Some background reading, if you want to know more:

Troubleshooting a Gas Oven That Won’t Fire Up

Making Basic Electrical Measurements

To learn more about your range/stove/oven, or to order parts, click here.