Perhaps you should consider if there is any pattern in those 20 digits. For example, if someone would have typed them "randomly", I can assure it is not really random and you could significantly reduce the search space.
For example, many digits would be next to each-other, or they would be based on the user using left right typing, e.g. 1728394 (look random but is only interlaced left right consecutive typing).
If this would be the case, even a 20 digits password can be cracked.
For example, many digits would be next to each-other, or they would be based on the user using left right typing, e.g. 1728394 (look random but is only interlaced left right consecutive typing).
If this would be the case, even a 20 digits password can be cracked.