Hello guys. Could you help me - need information about how long I must seed upload on Ncore. For example on GFT its min. 48 hours or 1:1, are there similar requirements on Ncore?

It is the same requirement on ncore,you have to seed 48 hours or 1:1 ratio.You can see it,if you click "Aktivitás"it shows the time remained.

Just a side note: ncore is a billion times better than GFT when talking about peers and overall activity, it's the best ratioless and ratio based tracker worldwide, imho (ratio based because if you reach 1/1 ratio on your torrent faster than 48 hours, you don't have to seed it for 48 hours, it disappears from the list) .But, if the ratio for that torrent is under 1/1, pay attention to aktivitas and make sure not to remove the torrent from your torrent client if it's still shown in aktivitas, it will count as hit and run even if you have seed it for 47 hours, for example.As soon as it disappears from aktivitas you can remove it from your torrent client as well, or you can keep seeding it if you want to.