I'm trying to turn what I did in my last job into a quantifiable metric. I am in need of a bit of guidance.
If it used to take [company x] two months to make push out a new feature, and now it only takes about an hour. What percent increase in time saved would that be?
First, convert 2 months into hours.
There are 365 days in a year and 12 months in a year, so on average a month has $\frac{365}{12}$ or 30.42 days. A day has 24 hours, so each month has on average $30.42*24$ or about 730 hours. 2 months is therefore 1460 hours.
To find the percent change in time, we first find the total change in time, then divide by the original amount of time, and finally multiply by 100%.
$$\frac{1460-1}{1460}*100\%=\frac{1459}{1460}*100\%\approx 99.9\%$$
The time required has therefore decreased by about $99.9\%$! You could also say that you now save $99.9\%$ of the previous amount of time.