You can always compare with the times listed here:
WCA Rankings
It all depends on what method you're using.
Let's call the last 6 turns the transform.
If I use the "twist" + transform on table, I'd get about 2 seconds at best. Sadly just the transform here takes me about 1.5 seconds.
If I don't use the twist method + transform on table, I'd get about 4 seconds.
If I don't use twist and transform in the air, I've gotten 3 seconds.
If I use the twist + transform, my times are much, much, much better.
Oh and if you're using an online timer, I find it much harder to get good times than on a stackmat.