Not sure if a specification changed in the last 4 years but yeah, this kata is entirely solvable in C#.

can you please write up a test case that would satisfy that to which you are referring?

Yes, and there are input constraints specified but there are no test cases to cover this. I am referring to this: "Input constraints: 0 <= h <= 23, 0 <= m <= 59, 0 <= s <= 59"

YOU DO NOT MANIPULATE THE ITERATOR WITHIN A LOOP(IF YOU DO NOT KNOW THE CONSEQUENCES)! ;-)

If we know the consequences of manipulation, why not? ^_^
Author said:

However, there is a bug in the method that needs to be resolved.

So our goal is to change a place, let the function work, right?
As your solution, should be called override or refactor @_@
In fact, the most important reason is that we are lazy, we do not know shame :D:D:D

The same here, all tests passed, but I always receive timeout, even with different solutions.

With simply adding each number it times out at 12345 for me. My original idea gets up to 12345678 before timing out. If it's solvable in C# I may try to find a faster solution. If I can come up with one..

I don't know if this has been updated, but I have been able to solve this problem. Perhaps you are summing number by number? There are more efficient ways!

Me2.
I got up to:

When12345678 Then381115683

How far did you get?

for the same to me!
i'm disappointment!!