1) I am in a readjustment period to life in my home country after living abroad for a long time.
2) I am in a readjustment period. I'm readjusting to life back home after living a long time overseas.
3) It takes a long time to reacclimatize*/readjust to your daily work routine after a long holiday.
*reacclimatize is correct but reacclimate is more common
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