Constant mpl_token_metadata::state::MAX_METADATA_LEN

pub const MAX_METADATA_LEN: usize = 1 //key 
+ 32 // update auth pubkey
+ 32 // mint pubkey
+ MAX_DATA_SIZE 
+ 1 // primary sale
+ 1 // mutable
+ 9 // nonce (pretty sure this only needs to be 2)
+ 2 // token standard
+ 34 // collection
+ 18 // uses
+ 118; // 679usize