Initially 50K to 100K , there are sites that are advertising a near $600.00 watch for $167.00 with the magic parts installed.
I bought 3 watches on EBay about 7 years ago, same company, but different designs, one of which is almost all rubber because of banging wrists and hands when working in the boat engine room.
All three are still running, I have not replaced any batteries . My cost on EBay was $18.00 USD ($6.00USD/watch)
I guess these new "magic" watches are very accurate, a great conversation piece, but IMO in my entire life I have never looked at a watch I was wearing a