>>3014615Find a developer that is chemically similar. Find a similar film to the one you want to develop that you can find dev times for for both developers. Compare the times. Note any differences. Now find the dev time for the film you want to dev with the developer your cross checking with and take that time and adjust it according to your findings.
That's how I found dev times for films in Fuji Microfine. No times to be found for any non-Fuji films.