In Apple Numbers, Version 6.1, I will convert a decimal value that expresses a number of hours into a duration value of hours and minutes, shown as hh mm. My table looks like this:
Lines Billing Rate Money Bid Time I can afford to spend (money / 35) Time in hh mm
100 1.5 / line 150 4.29 ??
I use an MBP 2016 running Mojave.