Leased lines typically have speeds of 1Mbps to 10Gbps.
The most common leased line is 2Mbps. However, 10Mbps and 100Mbps are becoming increasingly common.
Leased line speeds are the same in both directions. In other words, you can upload data at the same speed that you can upload it.
Your leased line is dedicated. You don't have to share it with anyone. This means that your connection speed doesn't fall at peak times, as happens with most ADSL connections.