Adding time durations as actual numbers
Hello,
We're trying to use Smartsheet to report on music details. It would be very useful to take the durations of music tracks (formatted either as mm:ss or h:mm:ss) and add them together together for a total duration. How would we attempt this?
Comments

If you locate successive tracks as children tasks connected to each other by a FS link (FinishStart, i.e. the standard link between tasks)
Then position a parent task on top of these → the parent will sum up the all sequence automatically.
Alternatively, you can use "+" or "=SUM(...)"
(Sorry I might have missed something because my answer looks too obvious. Do not hesitate to address more constraints if any)
Respectfully yours,

Unfortunately Smartsheet is not capable of calculating time as far as hours/minutes/seconds go. There are a few workarounds out there in some other threads, but they are all rather tedious and complex.

Since your data is formatted like this
[HHH]H:MM:SS
(assuming hours could be more than 9)
this formula will give you the seconds of a single cell:
=VALUE(LEFT(TL@row, FIND(":", TL@row)  1)) * 3600 + VALUE(MID(TL@row, FIND(":", TL@row) + 1, 2)) * 60 + VALUE(RIGHT(TL@row, 2))
(My column name is TL)
I would add a column to house this and then sum that column.
Craig

"I would add a column to house this"
We can call this column "Seconds".
"and then sum that column."
If you put the following formula into a column other than the Seconds column (top row of the TL column in Craig's example is what I suggest), Then it will sum all of the rows in the Seconds column and convert it back to HH:MM:SS.
=INT(SUM(Seconds:Seconds) / 3600) + ":" + IF(INT((SUM(Seconds:Seconds)  (VALUE(INT(SUM(Seconds:Seconds) / 3600)) * 3600)) / 60) < 10, "0" + INT((SUM(Seconds:Seconds)  (VALUE(INT(SUM(Seconds:Seconds) / 3600)) * 3600)) / 60), INT((SUM(Seconds:Seconds)  (VALUE(INT(SUM(Seconds:Seconds) / 3600)) * 3600)) / 60)) + ":" + IF((SUM(Seconds:Seconds)  (VALUE(INT(SUM(Seconds:Seconds) / 3600) * 3600) + VALUE(INT((SUM(Seconds:Seconds)  (VALUE(INT(SUM(Seconds:Seconds) / 3600)) * 3600)) / 60) * 60))) < 10, "0" + (SUM(Seconds:Seconds)  (VALUE(INT(SUM(Seconds:Seconds) / 3600) * 3600) + VALUE(INT((SUM(Seconds:Seconds)  (VALUE(INT(SUM(Seconds:Seconds) / 3600)) * 3600)) / 60) * 60))), (SUM(Seconds:Seconds)  (VALUE(INT(SUM(Seconds:Seconds) / 3600) * 3600) + VALUE(INT((SUM(Seconds:Seconds)  (VALUE(INT(SUM(Seconds:Seconds) / 3600)) * 3600)) / 60) * 60))))
If you're looking to use parent rows to show a total of each child row, you would replace Seconds:Seconds with CHILDREN(Seconds@row).

Here's a shorter version:
=INT(Sec@row / 3600) + ":" + IF(INT((Sec@row  INT(Sec@row / 3600) * 3600)) < 600, "0") + INT((Sec@row  INT(Sec@row / 3600) * 3600) / 60) + ":" + IF(Sec@row  (INT(Sec@row / 3600) * 3600)  (INT((Sec@row  INT(Sec@row / 3600) * 3600) / 60) * 60) < 10, "0") + (Sec@row  (INT(Sec@row / 3600) * 3600)  (INT((Sec@row  INT(Sec@row / 3600) * 3600) / 60) * 60))
I assume the Sec@row is the summed value.
Why this is shorter:
Instead of doing this:
IF (a very long formula is less than 10, "0" + a very long formula, a very long formula)
I do this:
IF (a very long formula is less than 10, "0") + a very long formula
Craig

I assume the Sec@row is the summed value.
In my formula, I used the column you put YOUR formula in and called it "Seconds" since it would convert HH:MM:SS into seconds by row.
With your single conversion column going by row, there wasn't a SUM yet. That's why I used Seconds:Seconds. To sum up all of the cells in your conversion column AND convert it back to HH:MM:SS all at the same time.
I do this:
IF (a very long formula is less than 10, "0") + a very long formula
That's definitely a good idea. It saves on space, and depending on the length of the overall formula, is less likely to exceed the 4,000 characters/cell limit.
I would just copy/paste the "very long formula" to avoid typos. Since it isn't very many keystrokes doing it that way, I didn't even think about doing it your way. Definitely going to try to keep it in mind though.

"Copy / Paste is the work of the Devil"  Craig Williams
Theoretically
A = SUM(a bunch of stuff)
B = use A a bunch of times
is faster than
B = SUM(a bunch of stuff) a bunch of times.
My personal character limit on formulas is something less than 500. If it is longer than 100, I reevaluate to see what I'm missing.
Craig

I love copy/paste when I know something is working. I have fat fingers.
And I see what you're doing. You're going ahead and summing up all of the seconds SUM(Seconds:Seconds) and THEN converting it back to HH:MM:SS.
Even breaking it down into 2 separate steps, it's still shorter and only one more extra cell used. This is why I typically defer to you, the Smartsheet Yoda. HAHA!
dchouston: Craig has the best solution (so far). Only look at my posts if you want to learn from my mistakes. Otherwise... You can ignore them.

Your answers aren't mistakes. They get the job done. In this case, one is it working, it is unlikely it will be changed  does anyone need to see DD:HH:MM:SS?
But ...
"Simple is better than complex. Complex is better than complicated."  Tim Peters
Glad I am willing to listen to my advice you are.
I'm going to post the back story on Copy / Paste to my website.
Craig

Thanks all...Smartsheet really makes you work for it, don't they!
I've got it all working. Now let's see if I can explain it to radio hosts...
Cheers,
David 
Good luck! Haha.
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