Solar Watches - Longevity?

[Oyster Lover]

Hiya folks,

Question regarding Seiko's solar watches, their longevity and how to properly store them!

I'd like to put away a couple of Seiko's solar watches for a few years (say 10-20 years).

What would be the best way to store them, and how to occasionally care for them? (for example, should I recharge them for an hour or two every six months, or charge them for a day once a year, or maybe not charge them at all, etc.)

I'd like to try and understand the best way for long-term storage on these Solar watches.

Thanks!!