Not really sure how you are accomplishing this unless you are getting takeout. Between prep, cooking, consuming, cleaning, that is easily 30 minutes to an hour. If you cook enough for several meals that mitigates the cost somewhat, but there are other sacrifices made there.
Perhaps an upper bound would be 50% plus his estimate, but even me, who I don't consider a ridiculous saver of time, shower within 5 minutes (from old clothes to new clothes), make breafkast and eat in in about 15m (egg omelettes are very easy), whip together and eat salads for dinner within 15m.
Time savings can be had without a huge reduction in life quality.