If riding in your own country you can do lots of distance quickly. You speak the language, know the places to get fuel, food and sleeping places. Say 400 km a day.
If your riding where you don't know much you can expect to do a lot less.. unless you don't want to see anything but just want the kudos of having 'done that'?
Plan on at lest having every 7th day 'off' - non riding, doing the washing, bike service, visas etc.
If you want to visit things then plan on having some days at each site ... how many times will you visit there in your life? May as well get some time there while you are there?
Some will 'travel' a lot faster than this ... but what do they see and experience? Not as much as someone traveling slower. It is your trip, don't let others dictate it, and be prepared to change the plan as things change (floods, fire and so on). Some don't plan at all, others plan too much.
Me? A rough list of things I want to see/do. You may have time constraints. Visas, job etc .. those will put a limit into your plans. Try to keep lots of 'free' days.. for siting and looking at the passing parade.