The technical was about 15 minutes and besides type related questions, they asked me general questions like take off and low visibility landing minima, tropopause height and why it is important to know and coffin corner. They asked another candidate, pointing at a jetstream at FL350 with minimum and maximum height, what is the speed of the jetstream at the minimum level. At least 60 knots...
The HR I think depends on your profile. I did my training in Poland so the questions were related to that. Just be yourself, and of course think about why you would want to fly for LOT.
Psychometric/psychological and sim screening are in the second stage and it seems they make them in one day.