Connected Lines

If the next line of the same speaker is around or less than 500ms (including lead-ins and lead-outs), connect the lines together by snapping the current line to the next line.

This means the end of the current time is the start of the next one.

Some subbers and viewers are more sensitive to short lead-outs and blinking, and may prefer lines to be connected even if they’re more than 500ms apart. This may be the case for people with low reading speed. For example, Madekuji has a preferred lead-out of 500ms-600ms instead of the standard minimum 300ms.

You can use the key binds “C” and “V” to add lead-ins and lead-outs correspondingly.
You can change the amount it adds by going to View > Options > Audio > Default lead-in/out length (ms) in Aegisub.