For a retractable you probably wouldn't be doing that more than once a day, and probably not for more than half a year, and less if if winds don't get too high. I can imagine 10Y life might be reasonable. But these don't seem to be retractable.
"The systems use monocrystalline solar cells backed by a 10-year product warranty."
"The systems use monocrystalline solar cells backed by a 10-year product warranty."