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How many signature stones does Tigra need

I just awakened her from a shattered heart crystal. She's at sig 20 and unless you get the first hit in the fight with light attacks her modes seem to expire to quickly to take advantage of.
My question is now how many sig stones do you need to pump into Tigra to take advantage of the sig ability.
My question is now how many sig stones do you need to pump into Tigra to take advantage of the sig ability.
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I recommend throwing a light attack as soon as the fights starts.
https://auntm.ai/champions/tigra/tier/6
Can someone further explain her ?