I put in his food once per day (in he morning before I leave); did the same from the beginning on. I work full-time which means I leave at 6am, come back between 5pm and 6pm, and by the time I got Taco, my husband (usually works from home) was not very much into reptiles, to say it like that (or, precisely: feared both the dragon and the feeder insects).
No issues at all. Taco eats his food over the day, and is not wolfing down everything in one sitting. He also behaved like that when I got him at 3 months old.
Despite my husband is now fine with Taco and the feeder insects, and might feed one or two insects extra (hand-feeding or into the bowl) during the day for bonding, I still put in his food in the morning before I leave: Insects, a salad, and there is always at least one live plant (golliwog, oregano) available and I water it in the morning.
So from my opinion: You can keep feeding multiple times per day for such as bonding, or if you suspect otherwise your dragon would wolf down the food in one sitting or avoids greens. Otherwise, there is also nothing wrong with feeding once a day if you are away.