Thought I replied, but guess I never finished...
The YN-560II's and probably other YN models have a sleep and auto power off feature. You can set the sleep to off, but the power-off will still happen at 30 minutes in the M mode (the only one that will accept a flash trigger) or 60 minutes in the S1/S2 modes (optical trigger only). Once it shuts off you have to physically hold the power button down to turn them back on. That means you need to ping them at least every 30 minutes to keep them alive. I used Stratos II triggers that have a wake-up function, so I just need to do a half-shutter press to refresh the YN's or just take a shot. It's only a problem if you stop shooting for a while or turn off a particular zone for a while. The last gig I used them, I had 2 different rooms with remote speedlights and I stopped transmitting to the zones for the room I wasn't in. I tried to remember to periodically turn the other zones back on and refresh them, but at some point I missed the window and lost one of the YN. I had to schlep up to the second floor balcony where I mounted it to turn it back on. Not a show-stopper, but something you may have to keep track of.
The YN-560II's and probably other YN models have a sleep and auto power off feature. You can set the sleep to off, but the power-off will still happen at 30 minutes in the M mode (the only one that will accept a flash trigger) or 60 minutes in the S1/S2 modes (optical trigger only). Once it shuts off you have to physically hold the power button down to turn them back on. That means you need to ping them at least every 30 minutes to keep them alive. I used Stratos II triggers that have a wake-up function, so I just need to do a half-shutter press to refresh the YN's or just take a shot. It's only a problem if you stop shooting for a while or turn off a particular zone for a while. The last gig I used them, I had 2 different rooms with remote speedlights and I stopped transmitting to the zones for the room I wasn't in. I tried to remember to periodically turn the other zones back on and refresh them, but at some point I missed the window and lost one of the YN. I had to schlep up to the second floor balcony where I mounted it to turn it back on. Not a show-stopper, but something you may have to keep track of.
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