Hi. Firstly, this is a similar topic like the previous one , the Pelagos accuracy, don't want to mix up, so I post another topic.
1. I had acquire the Certina DS Action Diver recently. I had try to monitor the movement accuracy , I'm pretty sure it use standard ETA 2824-2.
My method might be not right or not very accurate to monitor the movement accuracy. I use to sync my watch time to the iPad, handphone and digital watch stopwatch function to compare the +- s/day. I had wear it, put in on winder or just put in the box at various position while monitoring the time.
The result, my watch is average +24s/day. Within 48 hours test, +1-2minute. Is is acceptable? Or should I send it to SC to regulate the movement immediately?

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2. Is it ok to rise the watch winder TPD (turn per day) from 650 to 3600 to shorten the winding time for eta 2824-2? I put the watch on the winder at higher TPD at certain period i.e 3 hours. Sometime I use my winder just to fully wound the mainspring then monitor the power reserve. Will the mainspring or other part of the movement will damage or wear out quickly?
*2824-2 (650 TPD)