NET
8 Now, dear friends, do not let this one thing escape your notice, that a single day is like a thousand years with the Lord and a thousand years are like a single day.
Darby
8 But let not this one thing be hidden from you, beloved, that one day with [the] Lord [is] as a thousand years, and a thousand years as one day.
KJV
8 But, beloved, be not ignorant of this one thing, that one day [is] with the Lord as a thousand years, and a thousand years as one day.