Well, since your monitor probably has only roughly 2000 pixels/line even if you could draw your plot with every bit for the graph line (no axis, no nothing else) there would still be some ~131/2 --> 65 data points/pixel so it's physically impossible to have enough resolution to show it all at one time. You'll have to look at pieces of the time series at a time to visualize more closely..
doc zoom % for starters
doc xlim
