Re: How much?
I recall many years ago that a company successfully bid £120m to telecine the BBC’s entire film archive into a search engine optimised digitally accessibly format.
Then it was demonstrated that one (randomly selected) day from the beginning of the 1930’s had more than 100 hours of footage ranging up to more than 5,000 hours for events such as 6th June 1944.
I would be very wary of taking on a police contract to digitise anything (especially microfiche) unless you knew the exact extent of work to be done.