Nope. 5-6 each if they’re running.you assume it takes them 8 seconds to run on the field and 8 seconds to run off? no. you see the sub coming on the field and you get up and get your ass off the field. you want to wobble and take forever because a late sub (you weren't coming off due to fatigue) you risk the penalty. there is ZERO reason a college level athlete cannot see a sub coming within the first 3 seconds and have 7 seconds to get a maximum of 50 yards off the field. This isn't us running off the field. guys can be in motion vastly ahead of time to go out and get set.
and this is because we're subbing for matchups right? not just to take time off the clock? the idea was to protect for matchups/packages. you know in college football when you're coming off the field for heavy personnel, pass rush package, dime, etc. Illinois did it multiple times today where they started off the field then went back onto the field and slowly trotted off. that can all happen easily from within 10 seconds of whenever the judge gets up to hold the center.
Maybe 7 from opposite hash redzone.
But it takes more than 4-5 seconds to see the sub, order who is going in, who they are going in for.
You could solve all the issues by having wait time of 15 seconds max if there is over 15 seconds left on the play clock and a delay of game penalty on the offense if the offense subs with less than 15 on play clock.
Before about 1945 you played all 11 on both sides of the ball.