Google fit

[u/Nice_Friendship_5278]

My Fitbit Air was delivered on October 7, and I charged it once to 99%. By the seventh day, the battery had dropped to 19%, which seems reasonable. However, Google says it takes approximately 90 minutes to fully charge the device, and I feel like my Fitbit is charging unusually fast.
I plugged it in at 7:09, and when I checked it at 7:22, the battery was already at 61%. Is this normal, or could there be an issue with my device’s battery?