need help on long duration timer

**broken link removed**

if i add another capacitor as 10uF at S2, could i increase the timing from 100 - 1000mins while retaining all the resistors and capacitors mentioned in the circuit

pls advise.

thanks
naren

If you CHANGE it to 10uF, then yes. But if you ADD to C2 it will make it 11uF

thanks
naren