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I wouldn't debate you could survive nine hours in Indonesian waters quite comfortably: I've met someone who was drifting off Morotai for over 24 hours before a fishing boat picked him up (it felt like being born again, apparently).
But why do you think nine hours is the "worst case" scenario, here? We're talking about vast search areas - you can easily drift 10km in an hour in Indonesia, giving you a circle diameter of 20km, and that's assuming that it only takes an hour for your PLB location to reach the search boat and the search boat to reach that approximate location, which is optimistic. And you're looking at one or two boats with limited communication and navigation facilities.
I'd love to see an example where these sorts of precautions saved a life in places like Indonesia or the Philippines. I doubt there are any, and I'd guess that's because the type of person who dives with a PLB etc also chooses their operator carefully.
Signal of plb will go through in indonesia. Rescue time depend on the location of the military.
Case :
I went diving in manado area with my plb1 in a plastic waterproof flexible case. Upon surfacing, 15 min later i realized the plb was activated accidentally (due to pressure at depth). Since the antenna of the plb was not deployed and it was only less then 30 min of accidental activation? I did not think much of it (i thought for sure signal would not have gone through as antenna was not deployed and not much time was activated and went on our 2nd dive) (Activation was near resort dive site)
Upon return to land. We saw indonesian military personel at the resort (we thought it was routine inspection for that area). That was maybe less then 2 hour after discovery of the accidental activation. (Manado military have to take boat from mainland to resort island. 20 min away from mainlaind)
Later when we turn on our cell phone (cell phone reception signal only on land near resort) we we shocked to get many missed call, texts, and emails from our family emmergency contact. The message was : jakarta sar detected an activation of your plb near manado. North american Sar Contacted emmergency contact and verify situation. Family Emmergency contact said we were diving in indonesia and cannot reach us. North american SAR told our emmergency contact that jakarta said military was notified!!
That was when we panicked and realized that the plb1 is so powerful that even with the antenna down, and short activation time, the plb satellite signal actually went through! We frantically called NA sar and notified of the accidental activation. (Our family was panicking as they thought something happened to us)
After that trip we bought a proper hard case dive canister for the plb.