This is a great workout to build mental toughness as well as late race/ride power and endurance.
For even splits you need to pick your route with care. Find a route that has the same difficulty on both the out and back leg. The goal here is to record your time at the turn around and make it home faster. The longer the ride is the harder this becomes as you fatigue (and nature calls).
If you really want to challenge yourself find a route that is harder (headwind, more hills…) on the way back.