Starter from scratch

For those that created/fed their own starter from scratch, how long did it take for it to be truly “ready to bake” with? I started creating and feeding a brand new starter (AP flour & water) 2 weeks ago. I did the float test with water yesterday and my starter was floating, but it’s taking so long do double in size (8 ish hours, in the oven with the light on). I don’t want to jump the gun if it’s not ready.