It depends on the film, the developer, the temperature, the agitation, and the rated speed the film was shot.(posted 8600 days ago)For most B&W work the temperature is 68F. There are data sheets from the manufacturers of both film and developers recommending the starting times based on the EI (exposure index, or what the ISO dial was set to).
There is also the Massive Development Chart at www.digitaltruth.com. It asks you for the film size, then type, then gives you a chart of the recommended starting times for a bunch of developers.
You do need to test to see if these times work for you, they do OK for most work.
BTW you should put either a stop bath step or a water rinse in between the deveoper and the fixer. Otherwise your times are not consistant (development continues in the fix) and you will exhaust your fixer more quickly.
There is another thread on recommended films and developers for starting out going on now. Check it out for recommendations. Once you have a film and developer choosen, you can ask and people can recommend some times to try.