I wouldn't get caught up in the time... and if you are doing the work, fewer sets would be necessary to work to your current capacity. Think of it as quasi-HIT in nature, but I hate trying to hit any weight without some prep work, so I always do at least two sets, one lighter for a set number of reps, then typically my second set is heavier, and as many reps as I can manage out in a specific time period. Even if I rest a bit, the total amount of work done is defined by the time limit. So consider that quasi DC in nature.

As for rear delts, it has been my experience that rows are not really adequate, and truthfully most people don't have lateral delt issues so much as rear delt issues. But hey, it is YOUR work and I do encourage you to call it as you see it.