From Mindfulness in Plain English by Bhante Henepola Gunaratana, Chapter 15 ("Meditation in Everyday Life"):

The concept of wasted time does not exist for a serious meditator. Little dead spaces during your day can be turned to profit. Every spare moment can be used for meditation. Sitting anxiously in the dentist's office, meditate on your anxiety. Feeling irritated while standing in a line at the bank, meditate on irritation. Bored, twiddling you thumbs at the bus stop, meditate on boredom. Try to stay alert and aware throughout the day. Be mindful of exactly what is taking place right now, even if it is tedious drudgery. Take advantage of moments when you are alone. Take advantage of activities that are largely mechanical. Use every spare second to be mindful. Use all the moments you can.

(cf. Work of a Lifetime (2009-02-01), Plenty of Time (2009-03-09), Every Moment is an Opportunity (2009-03-24), Dimensionless and Therefore Infinite (2010-02-03), Mindfulness for Beginners (2013-07-18), ...) - ^z - 2016-09-15