ASUS Battery Information Center. The battery pack's service life will depend on the environment temperature, humidity, and notebook PC usage. The battery capacity usage versus cycle performance attenuation follows a linear type curve. Lithium-ion (Li-ion) batteries typically have a lifespan of between 300 and 500 cycles.
1 Some state that the average human attention span is approximately 5 minutes; others state that most healthy teenagers and adults are unable to sustain attention on one thing for more than about 20 minutes at a time, although they can choose repeatedly to re-focus on the same thing.
Typical attention span: When trying to estimate realistically how much time a child can focus. on one activity, you can use the following formula (source unknown): Attention span for learning = chronological age + 1. For example, an eight-year-old child (8+1=9) would have a nine-minute attention span for a. learning activity. This information can be quite useful when the tutor is planning his activities. for the tutoring session.