For aircraft and CTV delays, ALWAYS USE CODE 43. Express management is famous for trying to weasel you out of time by buying doughnuts or Egg McMuffins and then having everyone (yeah, team!!) go on break. Um, no.
Most states have laws that say a break must be offered after X hours of work. I would check your state laws. Split shifts are just so wrong, and FedEx abuses the Hell out of people with them. I've seen 3 and 4 hour splits at stations where management tells you to take longer splits when it's light.
Guess what? Light volumes are Fred's problem, not yours. I will never take a split, nor would I ever take a break when I could be on Code 43. Fred makes plenty of money, and he can afford to pay you when his planes and CTVs are late.
Don't let Fred pick your pocket.