חפיפה
https://www.almaany.com/en/dict/en-he/חפיפה/
overlapping period
changeover period
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http://www.lamakama.co.il/28881/איך-אומרים-חפיפה-בעבודה-באנגלית-וגם-איך-כותבים-חפיפה-בעבודה
https://dictionary.cambridge.org/dictionary/english/handover
https://www.collinsdictionary.com/dictionary/english/handover
https://www.merriam-webster.com/dictionary/Handover
https://www.dictionary.com/browse/handover
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on-the-job training (from a retiring worker to the one replacing him/her)
handover
new employee orientation or training
Transition Timing: Overlap of ~2 months availability