I think there might be some charts on the site that show the fastest-selling consoles, but you also have to compare that rate for different milestones. I'm pretty sure PS5 is one of the fastest to reach 30 million.
DS (a handheld console) already hit 100 million by March 2009, and Switch hit 100 million plus by March 2022. Wii hit 50 million by March 2009, which meant the sales were very front-loaded. After 2010, Wii sales were quite negligible compared to before.
Lifetime Sales Predictions
Switch: 161 million (was 73 million, then 96 million, then 113 million, then 125 million, then 144 million, then 151 million, then 156 million)
PS5: 122 million (was 105 million, then 115 million) Xbox Series X/S: 38 million (was 60 million, then 67 million, then 57 million. then 48 million. then 40 million)
Switch 2: 120 million (was 116 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima
