What is the opening with the most book moves in chess?

and if you shuffle peices around then eventually go back to the same position 1 move back another book move so there are infinite book moves in chess not only in FIDE rules but normal chess.com rules too

except that means that the actual number of max book moves on Chess.com is every book position times 2 and for FIDE rules every position times 3 then add 1 more move game ends in draw and you just got over 300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 book moves is that 1000 zeroes I don't know its 3 then 1000 zeroes book moves over that by alot

sadly with are fastest movers on earth we will never acheive this in under 20 years so bassicly lets just say the max amount book moves is almost infinite

This opening has 36 book moves (18 per player):

https://www.chess.com/analysis/game/daily/775464195?tab=review

it is 21 in the spanish