Lines chat with data in minutes

I have a Query Result that returns a column in time format like this
But when I try to create a visualization with Line charts it always show zero as you can see below:

How can I solve this visualization or else (and here comes a SQL question) how can I cast Minutes into Integer with sqlite sintax?
Thank you!

For your first question: what happens if you change the Y-axis scale to “Datetime”?

For your second question: can you clarify exactly what is the requirement?

00:38:35 == ?

@k4s1m, Thanks for your answer!

Well, I tried to change Y-axis scale to Datetime and it gets worse haha

About the second question, I mean 00:38:35 == 38.35 or 01:00:00 == 60 got it?

Thank you again!