Even if you're not "using" wi-fi, having it on will drain the battery. As will keeping your device on sleep mode as opposed to turning it off. But despite all that, 5-6 hours of use and 2 days of standby seem unusually low.
I have my device on airplane mode, 1-2 hours of use a day, sleep after 30 mins and off after 1 hour and it probably lasts around a month if I had to guess.
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