I have 10 pcs 200F supercap in series.

I want to calculate charging and discharcing time but these formulas does not work:

Charge time formula: τ=RC for charge time=5τ

I limited the charge current to 1.2A, so I assumed R=27(supply voltage)/1.2=22,5Ohm.

But it takes 10 minutes to charge to 27V.

I want to know that whether I'm calculating something wrong.