This has become a bugbear of late, the habit of trying to "decimalise" time. And quite frankly it's bloody annoying! People referring to an hour-and-a-half as "1.5 hours" To write an "hour-and-a-half" numerically would be as follows - 01:30.00 - that's 1 hour, 30 minutes and no seconds(the zero ahead of the 1 in the hour column is optional). If we look at video time then perhaps we'll write it thus in order to show the extra division, frames - 01;30;00.00 this then reads as 1 hour, 30 minutes, zero seconds, zero frames(in either 25 or 30 frames per second). In the first instance I've used the colon to separate hour from minute and the period to separate the minute from the second(but not as a decimal point). In the second instance, I've used a semi-colon between hour and minute, and again between minute and second with the period to divide seconds and frames. If this all sounds pedantic, I make no apologies because it is becoming a problem with the lazy way time is referenced in these posts. Time does not conform to decimal fractions! Half-an-hour is 30 minutes, not 50 minutes, an hour is made of 60, not 100 minutes, and a minute is made of 60, not 100 seconds.
Neil.