no idea

whats the minimum upload speed that an uploader should have? I have like 20/kbs(max, whith no download speed) upload and 70/kbs download speed whith no upload speed at all.

I find your post a bit confusing.

If you are saying your upload bandwidth is maxed out at 20kB/s, then I suggest you set your max upload to about 16kB/s when you are downloading, and unlimited when you are seeding.

Suspect

I wanted to say how boring(slow) is for a leacher to download from a 20kbs uploader…

A 100kbs uploader isn’t so boring(slow)

true, but most ISPs provide much less upload vs. download.

However if we all do our part in seeding, the download times will be shorter and shorter as the torrent continues.

Suspect

Not to mention that some ISPs also throttle Bittorrent so even though you only have a 256KB (AT&T basic) or 512KB(AT&T Pro) upload you can only get around 55KBs-70KBs. And worse on others like Rogers Cable.