Depends, dht or dht-client ? (continuous speed (both way summed up))
-
dht~1Mb/s~250Kb/s (a bit less) (actually this seems pretty inconsistent, some of my nodes are more arround 200Kb/s, while one is at 1Mb/s) -
dht-client~25Kb/s (depends of your usage, may be lower)
You can see the difference between both here : Data can only be found in IPFS after the server has been restarted - #5 by Jorropo