Few options:
- During the Leo cycle.
- Yeah, summertime fits.
- When something major regarding the specific situation is manifested; something dramatic needs to revealed first.
- Perhaps it can even mean "Soon!" It's a pretty positive card.
Major Arcana are nebulous when it concerns timing, though -- at least in terms of how I conceptualize it. Majors represent overwhelming (sometimes external) energy, so I've always interpreted it to mean the timing doesn't hinge on the querant. There's a somewhat "Let's just see" vibe about it.