Breaking the lineout down into its units allows much more intensive practice and more specific coaching opportunities. For example, in fifteen minutes a pod can easily make 30 or more lifts and catches.
Involving two pods or mix and matching pods can give you even more especially if you have two throwers available. Even more important, throwing, jumping, supporting and delivering the ball can be repeated until the fatigue threshold where poor performance begins is reached.
This should be the target. There are numerous useful drills - I'm a fan of 'Lineout Tennis' myself but it shouldn't be too difficult to come up with other equally valuable drills. Start with one pod who take the ball at a point between the 5m and 15m lines indicated by the coach's call.
On this front the more throws your throwers make the better - in fact throwers simply cannot practice their art too much! Asking them to continue throwing through their fatigue threshold is the only realistic preparation for play in a match.