This temple was built over 15 years.
(I want to say this temple took over 15 years to build)
e. more than) 15 years to build. "over" refers to the construction taking place over the stated period of time; it does not mean "more than".
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"This temple was built over 15 years" means that it took 15 years to build, not that it took over (i.e. more than) 15 years to build. "over" refers to the construction taking place over the stated period of time; it does not mean "more than".