Rounding to Quarter hour

Newcomer to numbers.. I can't seem to get my roundup logic working.
To break this into steps, it's a time analysis, but I seem to be missing something
c2=10:00
c3=10:20
goal is to have the equation return .5 here
I'd like to break down the logic I'm trying to use if you will all humour me.
Display a time difference as a decimal
=DUR2HOURS(c3-c2)
The output is as expected, .333333333333
Round that time difference up and limit to 2 places
=ROUNDUP(DUR2HOURS(c3-c2),2
The output is as expected, .34
This is where I run into an issue... In researching I have seen it stated to multiply that number inside the rounding portion by 96 and then divide by 96.. but I have to say, this doesn't make sense to me particularly, nor is the output what would be expected.
Sorry for such a basic question, I, in pursuit of learning numbers, want to understand why I'm doing this, not just stumble upon it.
Thanks for your help!

What are you thinking to be wrong in your result.
You are calculating :
=ROUNDUP((DUR2HOURS(C2-B2)*96),0)
which is 32
then divide this value by 96
which returns logically .3333333
I really don't understand what you are wanting to achieve.
My first thought was that you wished to convert .3333333 in minutes but it's so trivial that I assume that I thought wrongly.
Just for info to convert a decimal hour in minutes, you just need to muliply the decimal value by 60.
h00ligan76 wrote:
To break this into steps, it's a time analysis, but I seem to be missing something
c2=10:00
c3=10:20
goal is to have the equation return .5 here
I really don't understand which kind of equation may return .5 starting from the two given values except maybe :
=ROUNDUP(DUR2HOURS(C3-C2)*4,0)/4
which return
.25 if the difference is in the range 0 minute < C3-C2 ≤ 15 minutes
.50 if the difference is in the range 15 minutes < C3-C2 ≤ 30 minutes
.75 if the difference is in the range 30 minutes < C3-C2 ≤ 45 minutes
1.0 if the difference is in the range 45 minutes < C3-C2 ≤ 60 minutes
Yvan KOENIG (VALLAURIS, France) mercredi 25 janvier 2012
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