This is the incorrect way. You should be putting your flight time in minutes without the decimal as that's how the box reads the estimated flight time. A couple examples:
21 minutes - 21
1 hour - 60
2hrs 43mins - 163
Just a note about using decimals for time: it can be flawed. .21 doesn't actually equal 21 minutes. It really is just over 2 tenths of an hour, or 12 minutes 6 seconds. Please be careful when using decimals to represent time, and please don't use decimals in Infinite Passengers.