The above numbers are calculated using the following assumptions:
1. You are using the spell against something it can work to maximum effectiveness on. That is, casting something like Command - Flee on an archer would have a lower effect than casting it on a melee enemy who must spend his next round running back to the fight.
2. Concentration checks are ignored
3. For Fear I assume the enemy gets to make a saving throw each round but is 2 rounds from combat for every round the spell lasts.
Provided the target has a low chance of suceeding the saving through (70%+)
-Repeated save spells aren't that far behind single save spells 2.1 rounds lost vs 1.5 rounds lost
Most of these spells are wisdom save based
Many of these spells have some pretty restrictive targeting requirements
Bestow Curse (Level 3 spell) is the first control spell that works on everything
Banishment (Level 4 spell) also works on everything and scales well with higher level slots
Spells with a single save typically cause more rounds lost even if they have a substantially less chance to hit (within 25%). The only exception is if you get to really high chances to hit.