If memory serves, the 30 days are fixed, correct?
Kazakh border to Mongolia through the Altai is about 600 miles.
Ulan-Ude to Vladivostok is about 2000 miles.
IMO you can somewhat reliably project daily mileage for those portions. I believe the Ulan-Ude/Vladivostok portion is now completely tarmac.
Mongolia is the variable. There are likely some ride reports with time/distances for the "northern route" across Mongolia. It also depends on your bike and riding style. Mongolia can be hard on a bike & rider, even harder trying to do it fast.
Lastly, be sure to budget for border crossings that go awry, and once in Vladivostok, will you be there for a few days while you sort out onward transport?
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