Currently browsing these forums on a labtop via a mobile connection whose max download rate is 7kb/sec. Loading time per page is 3-10 sec if no huge pictures are present. However, I'm using Opera12 with an improved cache management and alot of addons in place that are disabling all that Google/Facebook/Twitter, also all SD adds aren't loaded in. So practically only text & html has to load with the exception of a few new avatars.
Without disabling the social networks it takes about 1-2 minutes for a single site to open, but mostly, it'll just get stuck somewhere and load forever.
edit:
just observed my netmonitor, to post this very answer only a total of 27kB UP/DL was needed.