I mean, there are several time stretch modes on both pedals, but if you're referring to the shuffler and masking alone, they don't time stretch.
Shuffler has one knob for the size of the buffer and one knob for the size of the grains (how many card there are in the deck). Those knobs interact quite a bit, so while the content of the buffer is continually rearranged (randomly), the sonic differences are tremendous. Small buffer plus small grains will give you a very artificial and cold sounding robotic effect while maxing out the buffer (1000ms) and having fewer grains will bring back low frequencies and give more of a "normal" delay sound with unpredictable repeats (sometimes normal, sometimes backwards and everything in between). Using the feedback knob (feeding the processed signal back through the shuffler) you can get some very interesting patterns happening.
In the masking mode the buffer is fixed to 250ms and the two knobs control mask rate (probability of masked grain) and the other knob controls the size of the grains within the buffer.
I hope that makes sense. I've started demoing it twice now, but there are just soooo many sounds in there that I only get 2-3 modes in before I find something new and forget what I'm supposed to be doing and just play.