I suspect that number is too high. 90 numbers per dial doesn't necessarily mean 90 valid positions. It could easily be 20 or 30 valid positions which comes out to a lot less. Plus, not all combinations of individually valid positions are themselves necessarily valid.

For example a standard Master dial lock has 40 hash marks but, IIRC, older ones had only about 12 valid positions. There was a trick you could use to find the third position, which would have left 144 combinations try except there were a few invalid combinations reducing to around 120. This is for a lock that a naive estimate would but at 40^3 or 64,000 combinations.