Convict conditioning workout length question

Slightly_Amusing

So I just started up CC and it's been an odd adjustment. According to the plan I am supposed to work two groups a day, three days a week. The problem I am having is that if I follow the plan from the level one section I'm only working out for about 15 minutes.

Example:
2 sets of 25 wall push-ups. Going very slow to make sure my form is correct
2 sets of 25 knee tucks. Same speed as above for same reasons.
That plus warm up is about 15 mins

Anyone else who has or is following this plan have the same experience or am I missing something