Question: How do I evaluate the summation in Maple

when i evaluate this summation if Q[h],S[h],R[h] are big floating numbers it take along time how i decrease this time 
P := simplify(sum(sum((t+1)*Q[h]^2*(1-Q[h])^(t+T)/(t+1+(R[h]/S[h])^sigma*(T+1)), t = 0 .. infinity), T = 0 .. infinity))

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