Odd tip / note for all FT players here, you can re-mud up exactly 47 seconds after you finish applying mud. You are still hidden from the Predator at this point but you will become more noticeable over the next 30 seconds. Mud lasts longer than the 47 second window, but re-applying it resets the timer. This also applies for all perks and the recon class.
If you are the ultimate min/maxer you can apply mud while sprinting if you slide, look at the ground and interact. You probably only save one actual second and only travel 1 yard further… but hey, the Predtor might have been aiming a Bow shot at your head that you now narrowly dodged.