At that time the galaxy was home to over one hundred quintillion (100,000,000,000,000,000,000) sapient beings.
That…seems like too many. Earth will probably cap around 10B people. That’s 10B planets with Earth-like populations. A search says Coruscant has 1T people on it, so that’d be 100M Coruscants. But I have to assume Coruscant is on the outer edge of population densities. Most would probably be lightly colonized like most of the world we see in the movies.
But then Star Wars is well known for just being waay out there will numbers and not being even close to realistic. :p
Honestly, it may not be enough. People, including sci-fi writers, chronically misunderstand the scale of space and how populations could fill in that space in a true galaxy-wide civilization.
Estimates place the number of stars in the Milky Way at 100 billion. This would work out to 10 billion lives per star in the galaxy. That doesn’t seem unreasonable, when we know that ecumenopoli exist and smaller versions of them exist in much larger numbers. We also know that terraforming of otherwise non-hospitable worlds is readily achieved in the SW universe. On top of that there are 5-25 million different species of sapient life, bringing even more classes of planets into this calculation.