I don’t ride full-gas workouts in the AM, but if I wake up late and commute to work, I can drill it for most of the 25-35 minutes without complaint (assuming not hungover or otherwise dehydrated). Coffee sorts itself out, I know I’ve got a 20oz traveler on my back , and instant oats at the office. Pre-covid I tended to do my intervals after the kids went to bed, but now I often tack them on to my commute home, either on the road or on the trainer immediately after getting home.