It didn't take too long to grind tbh. In a verse about speedsters, getting speed high is pretty simple. If it helps, Spin Dash, Boost, Drop Dash, and Super-Peel Out are all accepted as a 54x increase to speed. It's mentioned in the scaling blog on Sonic's verse page. The rest of the multiplier comes from Sonic jumping tiers in Base form, and any growth base Sonic experiences, Super Sonic experiences as confirmed in Frontiers (Though it was obvious in games prior too). Sonic went from single digit FTL to I believe around sextillions of times FTL now by Frontiers (when account for the new CRT accepted today). Meaning Super Sonic has also gotten around that many times faster since then. Then in between that timeframe, there's also scaling for Base Sonic, like catching up to Infinite who was previously scaled to Sonic's boost making him 54x faster, and by the end of the game, he's faster than Infinite casually, etc.
193 billion is several orders of magnitudes below what he actually scales to tho.