Limit "Extend to line before" Duration

[RaffyRF]

I usually imported lyrics from plain text (.txt) to make lyrics (.lrc)

So I mostly use "Extend to line before" shortcut if I want to work on the next line. The problem is if I use "Extend to line before" on a line without any end time, then it will automatically give maximum duration. What I want is to limit the duration for specific seconds (5sec) whenever I use "Extend to line before" on a line without end time, so I can easily adjust it with the waveform bar

Any help would be appreciated, as it would actually save me a lot of time and effort

[niksedk]

Just to be sure, what shortcut exactly are you using?

[RaffyRF]

"Extend selected lines to previous subtitle [Alt+Shift+E]"
or right click and "Extend to line before"