A stress tester's memories

Time acceleration throught virtual reality. A classic trope in novels and a dream for many but at which price? Claire is a single mother with a modest but stable life. Her daughter, her everything. She is reluctant to leave her confort zone until one day the diary of one of her former classmate fall into her hands. She will discover throught this diary the harsh reality of what happen when people try to mess up with one's perception of time.