You can use vim effects to do this. the "spell container" guideline is appropriate. This is the guideline used for waiting spell and watching ward rituals in the core book. In the core book it tells us that these spells require a ritual because of their potentially indefinite duration. In Rival Magic it further specifies that hermetic magic can't set up a spell that triggers under specified conditions without a ritual. This was probably a good move because setting up non-ritual duration moon or sun versions of waiting spell was exceptionally powerful and made things a bit easy for the characters.
However you could still make a container spell that holds its target spell for its duration then releases it. There is a duration concentration example in Magi of Hermes (Patient Spell IIRC). Here is a version I did a month or so ago on this forum using duration Hours from celestial magic (spell of punctuality fourth post down on this page) https://forum.atlas-games.com/t/gof-magical-obj-penetration/218/1
For your example a duration sun spell would work perfectly and I think that a version with the Faerie magic duration of until would be excellent (It would in fact be very similar to the faerie duration of bargain).
You could argue that instead of an associated vim spell one could instead use a special duration. Enchanted items and non-spontaneous magic are not restricted to the ranges durations and targets native to Hermetic magic. They can use unique spell parameters. To date in the published material this has been done by taking the closest equivalent parameter (being harsh in judgement of what is the closest equivalent) and then adding a magnitude so a spell with a "special" duration of fortnight would be five levels higher then one with a duration of moon.
I don't think that you'd win that argument though. A delayed effect is a pretty involved thing and I don't see it as just a weird duration. I'd allow it as a breakthrough of the easiest type. (Is lesser the correct term?)