how to model invoice days what are the x days until payment how to model the days until payment of an invoice in word how to model the days until the payment of an invoice? how to find the days to payment on an invoice how to find days to pay invoice how to calculate days till payment in an invoice calculate the days to payment of a check how many days to a payment how to find the days until payment of an invoice in excel which random variable would be used to model the days until payment how to calculate days to payment how to model days till payment when should the days between payments be calculated what variables are used to calculate the days until payment of an invoice when to start estimating days until payment when should x be calculated estimating days until payment in an invoice when does calculating the days until invoice payments begin which variable is used to calculate days until invoice payment?