Chaujoisoo18
Again, any return / roundtrip ticket is automatically a ‘day pass’ valid from midnight to 5am the other morning (29h total), therefore valid on any train or bus on that route. Just make sure to take the same route back, as a different route would most probably involve some other zones not included in your ticket.
You don’t buy such a return ticket for a specific time/train (unless you’d chose a supersaver ticket). It’s just that because a single journey zone ticket is valid e.g. only 2 hours instead of 29, the ticket shop is simply matching the ticket validity period with the connection you selected before.
That particular 9 o’clock day pass (I’ve also already mentioned above) is in fact valid only after 9am, but includes all Ostwind zones and therefore would also allow a different route on the way home. It costs 40.- full fare, while a 8 zone return ticket (day pass) is also 40.- full fare… that’s not significantly more expensive.