"...after a year, trainees found an additional 5 minutes of productivity per hour, per day on average. Those extra minutes of productivity can add up to an extra day of productivity per week or, from another point of view, 8 weeks of vacation per year, saving one prominent Silicon Valley law firm almost $3 million each year." Link.
Citation: Kim M. 'Little by Little' Supports Habit Formation. NIH Record. 2020(21).