Do you feel these are correct with the hyphens and absence of commas?
a 2-hour 15-minute traffic delay (Instead of: a 2-hour, 15-minute traffic delay)
a 7-pound 11-ounce newborn (Instead of: a 7-pound, 11-ounce newborn)
a 6-foot 8-inch basketball player (Instead of: a 6-foot, 8-inch basketball player)
a 2-year 5-month 17-day project (Look OK without commas?)
The project lasted 2 years 5 months 17 days. (Good without commas?)
If "and" is used, is it OK to forgo the commas as well?
The project lasted 2 years 5 months and 17 days.
Do all examples above look to be correctly punctuated without the commas? I don't think the commas aid readability in the slightest. Do you agree?
Thank you.