If intensity is threshold or above, I dont see how you could have two high-quality sessions within the same day (or why you wouldnt just increase volume in one of them). I would do recovery riding or endurance for one of the two.
I did a bit of bike commuting with ~1hr ride one way. Sometimes I would do intervals one way or sometimes I rode tempo in and intervals home. I wouldnt really call tempo ‘intensity’ tho.
But just like with everything, if quality goes up, quantity has to come down, vice versa (whether we want to believe this truth or not).