I dated a rapid fire squirter and she would have knee-shaking, face-soaking sprays in less than a minute.
If she was standing up, back against the wall with her legs spread, I would slip 2-3 fingers inside with tip of my fingers on the G-spot, the base of the middle finger on the clit, and the heel of my hand on the mons pubis then press, twiddle & shake as fast I could. She would pop over & over & over.
( position your hand in the classic rock-n-roll devil horn shape
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)
It was fun to sneak up on her when she was doing the dishes
She complained that multiple squirts would dehydrate her & make her insides ache but said it was worth it for the orgasm