Subtract two times, exclude weekends

I am looking for a formula that subtracts two times from each other. I do not want Saturday and Sunday to be counted in the calculation.

I was trying to use networkdays.intl but when the item arrived on saturday at a specific date and time and was done processing on Monday at a specific time and date the calculation showed over 24 hours where it should be under 24 hours. I would love for the formula to be in hours. Good Luck to whoever figures this out as it is not my first post on this.