Go for an hour. Just sit in quiet contemplation or bring some spiritual reading.
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If you don't have spiritual reading already, I could recommend this little booklet to read during Adoration. It's 99 cents on Amazon. https://www.amazon.com/Everyones-Way-Cross-Clarence-Enzler/dp/1594714304/ref=pd_lpo_sbs_14_t_0?_encoding=UTF8&psc=1&refRID=X21Y0XD96T3XFRCXW1YE