This largely depends on a few factors, the three biggest of which are:
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The upload speed that your ISP provides for your internet connection. Most residential internet connections have a substantially slower upload speed than their download speed, so be sure to find out what your connection's limits are.
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Whether your ISP uses traffic shaping to throttle your speeds based on the presence of P2P traffic from a computer on your connection. If this is the case, a VPN such as PrivateVPN will get you around this problem. Also, if you're on a DSL service and your ISP supports it, you may also be able to get around this problem with the use of MLPPP. If you wish to go down this avenue and your ISP doesn't offer technical support for MLPPP, I would be more than happy to assist you with it. On my connection here I am on a 3 line (soon to be 4 line) MLPPP setup, but this is largely because a single line simply won't deliver a reasonable speed.
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Whether you have the correct port for your torrent client forwarded both in TCP and in UDP from your router to your computer. This is the #1 most frequently missed step in the process that results in little to no upload traffic.
Of course, there are a few other factors, such as the number of leechers actively downloading the torrents, their connection speeds, what all else they're connected to, and so on, but the above 3 factors are the 3 biggest factors.
Also, remember, that DSL technology, especially the older DSL technology from the pre-Y2K era is a dying technology with very limited potentials. In terms of upload speed, you'd be looking at the following:
Copper ADSL2: 512 - 800 kbit
FTTN ADSL2: 800 - 1088 kbit
FTTN VDSL: 1088 kbit - 10 mbit
The biggest problem with FTTN service, as opposed to FTTP (aka FTTH) is the upload speed limitations, as they are largely dependent on distance from the SLAM where the copper begins. With Fibre going all the way to the end of the connection at the premise, the upload speed potential is far greater. The problem is that most of the world still hasn't rolled out this kind of technology.