Learning and executing are 2 very separate things.

In 30 minutes you definitely can execute a campaign. Then come back a few days later and spend another 30 minutes reviewing and optimizing.

Learning is something that is very separate from the request process. The 30 minutes is execution time post-learning.

That being said, for quick results Google AdWords is a very reliable channel for hyper local businesses. There definitely are other passive lead generation channels like Instagram, but as an example Google AdWords is an easy go to.