Probably sounds about right. At first I thought you meant that you left the water heater on all day long but yes just turning it on to actually take a shower is what we do. We don't even fully heat the water to the point of letting it shut off on its own.
If if you had a leak there'd be a good chance that you would smell it somewhere around you rig. I had a t fitting underneath a TT with a loose fitting and it wasn't leaking real bad when I put soapy water on it to look for bubbles but just a little bit that it leaked I was able to smell it when I walk by.
If you can get to the tees and other fittings underneath, you can spray them with a soapy solution and look for bubbles. Also the hoses regulator.