Rev 2:10

10 Don’t be afraid of the things which you are about to suffer. Behold, the devil is about to throw some of you into prison, that you may be tested; and you will have oppression for ten days. Be faithful to death, and I will give you the crown of life.

you will have tribulation for 10 days – there are two explanations for this. The first is that there were ten persecutions from Nero to Diocletian; ten “days” as ten periods of persecution. The second explanation is that the Great Persecution lasted ten years. Throughout Daniel and Revelation, days are actually years, and so the “ten days” here can mean “ten years.”

I will give you the crown of life – the Greek word for crown describes an Olympic garland of victory. A diadem, in contrast, is a thin band, worn in battle.