around-the-clock vs everlasting

around-the-clock

• All day and night; all of the time. 

everlasting

• Lasting or enduring forever; existing or continuing without end 

• Existing with infinite temporal duration (as opposed to existence outside of time). 

• Continuing indefinitely, or during a long period; perpetual; sometimes used, colloquially, as a strong intensive. 

• Extremely. 

• A durable cloth fabric for shoes, etc. 

• An everlasting flower.