Add an option to display a bar chart of hours played per day for a given time period to let you keep track of how well you are doing at putting in volume in a convenient format.
Other options could include displaying hands instead of hours and various time options - a choice of displaying a bar for each day, each month or each year in the selected time period, for example.
uservoice link: Graph hours/hands played vs time
uservoice Votes: 18