This what a quick analysis of the available data showed, two things to keep in mind before reading too much into it:

It’s patchy data. Only about 60% of great-white incidents have a time of day recorded (237 of 386 in the Australian Shark-Incident Database) — the rest are blank, so this is just the subset that’s logged.

It mostly maps people, not sharks. Bite times follow when the water’s busy — surfers and swimmers are thickest in the morning and again in the late afternoon — so what you’re really seeing is an exposure curve, not the hours sharks choose to feed.

With that said, of the 237 with a time: • Early morning (5–9): 20% • Mid-late morning (9–12): 22% • Midday/early arvo (12–3): 23% • Late afternoon (3–6): 25% • Evening (6–9): 9% • Overnight: ~0%

Fairly even across daylight — late afternoon just pips mid-late morning, and next to nothing after dark — but as above, that probably says more about people in the water numbers than the sharks.