Chorley to Stalybridge (off peak day return) is a whopping £16-something. Total rip-off of a fare that, wonder if the ticket sellers would say "no, have a Peak Wayfarer" at £11".
Saying that, it's probably easily splittable Chorley - Horwich ret and then Gtr. Manchester Day ranger as long as you are off-peak.
But if I was unused to rail travel, and went to the ticket office for a journey of, what, 30 miles (?) and was told £16.60 ret OFF PEAK then you'd have to pick me up off the floor.
Please don't confuse by calling it a Peak Wayfarer. There is a thing called a Derbyshire Wayfarer and a Manchester Wayfarer (abbreviated by the ticketing system as GM WAYFARER). Chorley to Stalybridge is indeed £16.60 SVR or £19.40 SOR - which is utterly bonkers, and there will be people out there, paying that. The reason for the immense expense, particularly for the Anytime ticket (although note that the off-peak ticket can be used after 0859) is the lack of a day return.