Hello,

I have a problem with the calculation of time durations in tables. I hope someone can help me.

*How to calculate a vector (list) of time durations in tables?*


Subtraction of numerical vectors works directly:
```
| day              | t1       | t2       | differences |
|------------------+----------+----------+-------------|
| [2021-04-08 Thu] | [10, 13] | [16, 18] | [6, 5]      |
#+TBLFM: $4=$3-$2
```

Using this with time vectors to compute durations) doesn't work. It computes only the first item:
````
| day              | time 1         | time 2         | durations |
|------------------+----------------+----------------+-----------|
| [2021-04-08 Thu] | [10:45, 14:00] | [12:00, 15:00] |     01:15 |
#+TBLFM: $4=$3-$2;U
````
I would expect this:

````
| day              | time 1         | time 2         | durations     |
|------------------+----------------+----------------+---------------|
| [2021-04-08 Thu] | [10:45, 14:00] | [12:00, 15:00] | [01:15, 1:00] |
````

I hope there is an (easy) solution (?)

Best Regards
Frank