I've just completed another retightening. It took just about 5 hrs over the course of 4 days.
Day 1: 2hrs
Day 2: 1hr and a bit
Day3: 1 1/2hrs
Day 4: 1/2 hr.
I'm doing OK with this retightening thing. I've got a rhythm going. I've also combined most of my smalls to medium and dramatically shortened my sessions. I've also saved many locs from premature death. So far, I lost 1 loc and I'm not about to lose any more. Like Nubianlockedprincess said "Small locs are great, but you have to know when to draw the line with large loc numbers! They too come with a price!"
I guess I lost my desire to have gazillion locs especially bc I DIY. Also I just can't stand to see a skiny loc hanging by a thread. I saw the size of dewdrops locs and I thought, those look pretty sturdy and healthy whilst still maintaining the sisterlocks look so why not strengthen some of my own weaker looking locs. So I did. I'm very pleased with the results. I still have around 360-ish so it's still a high number, but I'm comfortable with that.