Use PLX-DAQ to send the serial data to an older version of Excel. This is a freebie macro that effectively turns Excel into a terminal, thereby enabling you to have live Excel graphs. Data is timestamped using PC clock
Use an Android device to receive the data wirelessly over Bluetooth. I use Bluetooth Graphics Terminal on phone and tablet
Same thing with Bluegraph. This can have more lines.
Items 2 and 3 have volatile graphs and don't log time - and hardly need to. They can both log the data as well, including time from Arduino's clock, for subsequent pasting into Excel, but I use Bluetooth terminal for that.
All three options just use the Serial.print and take virtually no more effort than sending data to the serial monitor.