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Thank you :)
15 seconds is the amount of time that I usually use :)
It seems to work best on my phone. Any advice you could offer me?

Unfortunately, I don't have any advice, I am not aware that my phone can adjust the exposure time, I would love to be able to do this. (iPhone) Do you use a special app to do it or does your phone have it built in as a feature? It is a nice feature.