Monday Muddle: overtime, over time

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Monday Muddle: overtime: (noun) the period of time that is beyond the amount of time scheduled; typically used in relation to extra work hours or extra time in a sporting event added to allow a player or team to break the tie; the payment for work done beyond regular hours over time: (preposition + noun) gradually; over a period of time

“Opinions can change over time” means that as people grow and learn more, they many change their beliefs on a given subject. 

“Opinions can change overtime” indicates that you have an understanding employer who is willing to not only listen to but also potentially act upon your feedback regarding the extra hours that you work.