Frequency help?

Tarzan swings back and forth on a long vine. His friend Jane notices 30.swings in 2.4 minutes what is the frequency and what is the vine length?

I got the frequency at .208Hz which when I converted it to T (f=1/T) I got 4.81 then I plugged it into my equation T=2(pi)√(L / g)

but I end up getting 557 as my answer which does not seem right. Can you tell me where I went wrong?

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