En Route: xx Tanks on sale for $xx each (Arrive in 155.5 mins)
En Route: xx Jets on sale for $xx each (Arrive in 167.1 mins)
En Route: xx Troops on sale for $xx each (Arrive in 3.3 hours)

Just curious about the time to market. These three sale* orders were submitted all at the same click. Is there a mechanic that defines a different time to market by unit type or simply staggering by count of unit? Feels odd and wasn't sure if this was a bug.

It's not a bug that the time to market varies. It should be random somehow. It is affected to a degree by luck (the permanent bonus) according to what is written about it.

Would be cool to have a bonus section to decrease time to market.

Thank you!

Help Information on Bonus Types

"Luck is the subtlest of the permanent bonuses. Investing in luck will lead to better explore returns, greater missile production, and lower market times. In addition, lucky countries have a greater chance of getting spy ops against countries with better spy networks and a greater chance of successfully attacking when oversending."