For an experienced professional plumber, replacing an existing garbage disposal typically takes between 45 minutes to 1.5 hours. The exact duration depends heavily on whether the existing mounting assembly can be reused or if the sink flange must be completely uninstalled and resealed with plumber's putty. If complex modifications to under-sink PVC drain plumbing or electrical wiring are required, the job can easily take 2 hours or more. Verification: Test all under-sink connections for leaks immediately after the plumber completes the installation.
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