Slots that usually give a cleaner run
Early or mid-morning weekday moves are often easier because parking is more controllable and shared buildings are quieter. That gives the crew a better chance of loading once, cleanly, rather than stopping and restarting around other road users.
When to think twice about the timing
If your route depends on a busy bay, school-run gap or access through a shared entrance, avoid the slot that clashes with the local peak. In Llanelli, the calmest window is usually the one that protects the loading phase, not just the drive.