Hey Ascent; that time frame is absolutely fine as it is giving yourself time to get comfortable with the process of drawing the figure before worrying about speed, with experience speed will come. It's a nice set of studies; though, they are quite stiff. This is subjective and based upon my experience, but, you have outlined the contour of each figure and there isn't much on the inside, apart from a line a cross the ribcage; this is making them look very flat.
A couple of things to try would be, starting with a simple gesture and building on top of it, drawing from inside the figure, using shapes to suggest muscle, fat, etc and building up to the contour rather than just copying the outline of the figure. Try using cross contour lines that go across the surface of the form to show volume. This is what I tend to do in 3-minutes, it can be done in 2-minutes. For 30-seconds and 1-minute I simply draw the gesture, and maybe add spherical forms if time allows.
Long, confident, sketchy lines placed with consideration (in my opinion) are fine, however, stitching lines together (creating a long line with multiple smaller lines) should be avoided, but I don't see that here anyway.
I wouldn't worry about posting stuff like this, we're here to learn, part of the learning journey is to sketch, experiment, fail sometimes and then learn from it and progress. Again, it's a nice page of studies and exercises and the line of action for each pose is consistently solid 
