im talking about recovery time in between sets..that workout looks horrible
Yeah, that's the idea behind a giant set - lot's of work in a little bit of time. There is a method to the madness:
Begin with a high-load partial ROM, allowing for CNS preparation (i.e. Pin squats)
Transition to a more demanding movement on which you must use a much lighter load (Front Squats). Using the Pin Squats first will make the Front Squats feel lighter.
Transition to an easier movement and either maintain the load or increase is slightly, depending upon your training capacity (Back Squats). You descending a ladder of difficulty as the set progresses, and you'll be winded now but the squats should still be easier than the front squats you just did.
Finish off with an even easier movement with smaller ROM (BB Hacks) and your quads will thank you.
The CNS is fine because in between each movement, even if your transitioning as fast as possible, you'll still have 10-15sec of lag time. Additionally, you're not using maximal load - only 2-3reps with a 5RM.