Hello Zoran and team,
On both Chrome and Safari browsers, the importing of longer YouTube videos does not result in the video’s text being split into shorter lessons.
^ The link, listed above, is a 46 minute video that I was able to import, but it was imported as one long lesson; hence, actually going through the lesson made it laggy often.
I am using the most up-to-date LingQ browser extensions.
Please let me know if there’s any more info I can provide to help rectify this issue.