How many years are temporary monument markers expected to last?

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Temporary monument markers are used to preserve the position of survey data while field work is ongoing and before permanent monuments are placed. They’re not meant to last indefinitely; the idea is for them to endure long enough to complete the necessary measurements and rechecks, but not so long that they become degraded or cause confusion as plans change. Two years is the typical expectation because it balances enough time for the project to proceed with the finalization of the markers, while minimizing the risk that the marks fade, are damaged, or mislead later surveys. One year can be too short for many projects, especially with delays or seasonal work, while three or four years increases the chance of issues that require re-establishment or clarification. So, two years is the best-fit duration for temporary monument markers.