Golden Apples

Not sure if there is a good site that counts but a quick eyeball seems to point to 40-50.
If you wish more precise numbers then the cirnopedia has every event listed along with mission rewards or point ladder prizes.

For more information you can read up on
https://fate-go.cirnopedia.org/quest_event.php#2017

If there are any long downtimes then we might receive additional apples so it is an approximation (for instance when the iPhone bug came we ended up with perhaps 18 golden apples)

Apples for secret gem farming... Don't be surprised if you are disappointed with how few you get from the apples. I think the drop rate is better in the event than the training grounds, but if you can hold off till nerofest there's going to be plenty in the lottery.

Nerofest doesn’t have gems iirc. Only Christmas does.

But we’ll easily get 70+ apples by the time NeroFest rolls around and another 50 or so by the time Christmas arrives.

Check the event drop sheet: https://docs.google.com/spreadsheets/d/1qvxLU407QwiFaCvItqR16SqqAVlLD5u5nBzY_bCFYvs