Ideally, you could perform a negative development time test. Basically, you expose a step tablet, like Stouffer on 5 sheets, rolls etc, then you develop each for a different length of time, using your normal agitation etc. You measure the results, plot 5 curves, and figure out your own development time.

Easy to say. Now you can enjoy the millions of posts here on the ins-and-outs of what happens, and how to interpret the results. Perhaps you should plan on doing this some time in future, not yet. B&W process is extremely forgiving. Enjoy the fun of it, though.