If I missed that you explained you were using Keepass then it seems so did a few others (although I notice something in the OP now which I don't recall seeing before).

Very strange that you would say you "forgot" your 30-40 character password anyway - if you were using a tool then you would never have "remembered" such a password in the first place.

There have been a few newbies before wanting to work out how to crack encrypted wallets that looked rather suspicious (hence my question).

In any case as has been pointed out 30-40 unknown characters is not going to be able to be cracked.