Clock Runs

My clock runs 16 minutes fast after 18 hours?

by what percentage should I increase the length of the pendulum?

That means that it completes the same number of oscillations in 1096 minutes in actual time 1080 minutes.
=> If T is real time period and T' that of your clock,
1080 / T = 1096 / T'
If l = length of the pendulum of correct clock
and l' = length of pendulum of your clock
T / T' = √(l'/l)
=> l' / l = T^2 / T'^2 = (1080 / 1096)^2 = 0.971
=> (l - l') / l' x 100 = (1 - 0.971) / 0.971 x 100
nearly 3%.
=>

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