RPL, 8 bytes
3E10WAIT
shall wait 3e10 seconds on, say, your hp48sx. Good the OP excluded hardware issues, so we can ignore the reboot at the end of Dec. 31st, 2088 (the date is reinitialized to Jan. 1st, 1989.)
For RPL/2, add one byte as a space is needed before WAIT
.
I am surprised such commands are accepted anyhow…
Btw a challenge about 2763 years would allow us to use the factorial as in 14!WAIT
.