File:Special Duration Up Count Chart.png

Formulas
Burst Bomb: (6*(1+(0.99*x-(0.09*x)^2)/50))/(22/60)

Splat/Suction Bomb: (6*(1+(0.99*x-(0.09*x)^2)/50))/(31/60)

Seeker: (6*(1+(0.99*x-(0.09*x)^2)/50))/(35/60)

Inkzooka: ((6.5*(1+(0.99*x-(0.09*x)^2)/55))-0.92)/(53/60)