In the window that appeared after the computer boot noted that computers start lasts 19,108 seconds.
The problem may be that the computer was running after “boot-time scan”, and then after some time went into sleep mode.
Translation: 5h and 18m, in other words?
What avast program prompted the boot-time scan and what program reported 19,108 seconds to boot?
19,108 seconds is almost 1/3 of a minute ;D
You forgot the comma Bob 
19108 seconds. - Even with a comma (which isn’t a decimal point), the figure is the same 19 thousand, 1 hundred (and), 08seconds.
A comma is commonly used to indicate groups of 1 thousand, in that 19,108 seconds. etc. is indicating 19 thousand 1 hundred and 08 seconds.
You need to buy a new calculator as yours is clearly broken.
Please stop splitting hairs. The OP clearly knows what he entered and meant, I rather doubt he would be overly concerned if the time delay to go into sleep mode was only 1/3rd of a minute.