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Reference.org
Time-saving bias
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<p>Time-saving bias is a concept that describes people's tendency to misestimate the time that could be saved (or lost) when increasing (or decreasing) <a href="/facts/Speed/I3qgMPfs">speed</a>. </p><p>In general, people underestimate the time that could be saved when increasing from a relatively low speed—e.g., 25 mph (40 km/h) or 40 mph (64 km/h)—and overestimate the time that could be saved when increasing from a relatively high speed—e.g., 55 mph (89 km/h) or 90 mph (140 km/h). People also underestimate the time that could be lost when decreasing from a low speed and overestimate the time that could be lost when decreasing from a high speed. </p>