Tides charts are not 100 percent accurate.
Slack tide means it is as low or as high as it will get on that tide. The moon effects how high a tide will be, 2.9, 3.2 , 3.5 (measured in feet) and how low it will be. -0.9, -1.0 etc etc etc.
Depending on where you are this can last 20 minutes or an hour or more....the canal is famous for breaking tides - slack tide at dawn....big plugs on top...you get the idea...
Every spot is different, only on way to learn, and it's not being in front of the computer.
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