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How long does the proof of work take today and in future?

Can someone explain how long the proof of work needs today and how long it may take in the future? I always think about if paying in a supermarket with IOTA will ever be possible. And right now I need a long time to log into the light wallet, than to do the proof of work and after that get confirmed by the tangle network. So I guess people behind me will be upset if I pay with IOTA.

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