Yes - barring "incidents"!
4 battery sets (7771xx) on the Liverpool Central - Headbolt Lane service. Every 15 mins, so sequence repeats after an hour.
8 diagrams (generally single 7770xx, but you might find a battery set being used on one or two) on the Ormskirk - Hunts Cross service. Every 15 mins, so sequence repeats after two hours.
8 diagrams (mix of single and double 7770xx - very occasionally a 7771xx) on the Liverpool Central - Southport service. Every 15 mins, so again, sequence repeats after two hours.
... and of course, as you're part way along the route, you'd actually see each unit twice in that one or two hour sequence - once inbound, once outbound.
... oh, and an afterthought - if you jump on an Ormskirk or Headbolt Lane service out of Sandhills, you'll pass Kirkdale depot on your left, where there's usually a handful of spare (or demic!) sets hanging around.