If you have time of use (TOU) billing for you utility bill, I have found a simple approach to approximate a charging timer. Generally, I will start charging at 7PM but my off-peak does not start until 12AM which means most of my charging is complete by then. Until Tesla comes out with a charging timer option and I do not want to make a special trip to the garage at midnite to take advantage of the (much) lower off peak rates, I simply set the max amp setting to whatever is needed to stretch out the charging time until 6AM. For example, an amp setting of 10A , will take about 10 hours to charge instead of the 2.5 at 40A which means that now most of my charging is done in the off peak period. Although not perfect, I have reduced my electric bill by half over what it otherwise would be.
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