The best way is to give the medicine at somewhat regular intervals, compatibly with your working schedule. If it’s 2 per day, I assume it’s a dose every 12 hours? (if you don’t know, do check in telephonically with the vet). Once you’ve roughly made a timetable, follow that and you’ll be good to go. It’s better to give the dose a little bit later than too close to the previous one. It happened that I would be 1 or 2 hours late on bunny medicine (and my own medicines, lol) , but I’ve always preferred that.
Personally, I always wash out the syringes with warm water after each use… if the medicine leftover inside gets all sticky, the syringe won’t be working as smoothly as it should. Also, leftover medicine is not being stored correctly, so it could be ineffective. Try to be as precise as possible when sucking up the meds (an insuline syringe will do the job), so that you won’t waste a lot of it and save money 