Hi Puffin,

Thanks for the comment! :)

1) To be honest I was not sure why but this was the way I learned at school and used back in the days when I was working in banking. After google searching, it seems that financial often use 360 days but it seems that we could also use 365 days: https://www.quora.com/Why-is-interest-calculated-for-360-days-in-a-year-whereas-there-are-365-days-and-366-days-in-a-leap-year

2) Totally agree. NFT projects should be careful when designing their NFTs and careful with the way they promote. To promise "passive income" is halfway to start having doors closed on their face.