Fix typo -> 570 seconds to 570 minutes.

README.md

@@ -45,4 +45,4 @@ Details of the run are visible at https://wandb.ai/josephc/tiny_doodle_model/run
 
 ## Power Use and Environmental Considerations:
 
-The model consumed 120W for a duration of 570 seconds for training the final version.  Excess heat from the training process was used to heat the home of the author in place of gas heating.
+The model consumed 120W for a duration of 570 minutes for training the final version.  Excess heat from the training process was used to heat the home of the author in place of gas heating.