Your flowering time is dependent on the strain you are growing, each strain has different flowering times. The amount of light doesn't change the amount of time to flower or to mature.
It doesn't take any longer then using HID but it's easier to grow dense nugs with HID, but it is very possible with cfls as that's where I started out. It's all about keeping them close.
Yields are depending on if you trained any or how healthy the plant is, amount of lumens on her. Just really a lot of things. You can yield just as well with cfls as with HID if you have enough light.
Oh and not sure if you are already flowering or if you just started but if she is 3ft tall and your just starting to flower it's going to stretch 2-3 times that, so you will end up with a 6ft+ plant and with cfls it's really hard with that big of plant, that's why most cfl growers veg short and flower early to keep them small and train them.
If you have any other questions let me know.