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The applewatch is completely dead and needs half an hour to turn on. If you use the original charger to charge the Apple Watch, from low to full, it will take about three hours. Don't force it on again before charging. Because it is constantly turned on, it will quickly consume electricity, and the lithium battery of the watch can not be over-discharged.
Once the battery is over-discharged, the battery may be damaged, please charge at least 10% or more before trying to turn it on
The apple watch 7 can be turned on after 4 hours of charging
Charge it for 4 to 5 hours and you can turn it on. The first use of charging 4 to 5 hours can be turned on, the power is not less than 20%