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Time yourself, two mins tops
Yay, in the winter we could have competitive Kubi glove changing competitions on Zoom!
Now the good news. Each pack of two gloves come as both left handed, both right handed or one of each in white or black. For some reason one glove (my left hand) goes more frequently than the other.
Left hand got soaked, right hand pretty damp.
Check the ring to suit area. Could be there's a leak there. Could even be a leak in the arm that's running down when you lower your arms post-dive.
Time to inflate the suit. Get a (large) cooking bowl and shove into the neck-hole. Connect both gloves then inflate the suit in a quiet room. Inflate it so it's quite solid -- will need quite a lot of air for this (the big cooking bowl can pop out!). Listen for hissing. Wet your hands whilst checking for leaks (you can feel the cold of the escaping air more easily).
As you know it's just the left hand/arm, could use a bucket of water -- maybe put a dive weight in the glove before inflating so it'll sink?