while IFS= read -r line ; do
    let var+=line
done < <(some command returning multiple lines)
echo "$var"

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TitleTime
dcfghjkhgfgbnm b dxfgfdgh...6 minutes
sdfsfd1 hour
sddsf3 hours
dsfdsf4 hours
sdrfyuhjhgf fgtyhjklkjhgf...5 hours
eaf7 hours
safdasdf12 hours

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