You may lose many things in life and you may mourn them and wish you get them back. Sometimes you might get some back or be paid or rewarded in another way for example money, but what you can never ever get back is Time. The time you already spent, you will not be paid it again. Your days and years that you spent sad, afraid, whining, angry or not learning or achieving are lost as Ben Franklin said "Lost time is not found again”
Always be conscious about how you spend your time and how you respect other’s time spent.