How to sumarize corectly datetime (difference between end_date and begin_date) - mysql

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MySQL

DateTime

I'm using in mysql. I've created table "Sikcness" and I've added one record:

+--------+---------+---------+-------------+--------+----------+
| Id_SICK|ID_WORKER| BEGIN_DATE          | END_DATE            |
+--------+---------+---------+----------+------------+---------+
| 1      |   1     |2019-03-18 07:00:00  |2019-03-20 15:00:00  |  
+--------+---------+--------+------------+----------+----------+  

Then i'd like to sumerize in time (Time difference between End_date column and begin_date column) by the command:

SELECT SEC_TO_TIME(SUM(TIME_TO_SEC(Sickness.END_DATE) - TIME_TO_SEC(Sickness.BEGIN_DATE))) AS 'SICKNESS TIME' FROM Sickness WHERE ID_WORKER = 1

But i have only that result (which is incorrect):

SICKNESS TIME
08:00:00

That command should count it like this:

+---------+-------------+--------+----------+
| BEGIN_DATE          | END_DATE            |
+---------+----------+------------+---------+
|2019-03-18 07:00:00  |2019-03-18 15:00:00  |  
+--------+------------+----------+----------+  
|2019-03-19 07:00:00  |2019-03-19 15:00:00  |  
+--------+------------+----------+----------+  
|2019-03-20 07:00:00  |2019-03-20 15:00:00  |  
+--------+------------+----------+----------+ 

Then it would be correct:

SICKNESS TIME
24:00:00

What kind of mysql query should i write? Any ideas? Greets.

What I have tried:

I've tried only with this command in below:

SELECT SEC_TO_TIME(SUM(TIME_TO_SEC(Sickness.END_DATE) - TIME_TO_SEC(Sickness.BEGIN_DATE))) AS 'SICKNESS TIME' FROM Sickness WHERE ID_WORKER = 1

And it didn't work :(