This is a cryptogram.
Each spaceship corresponds to one letter of the alphabet; images are from Scott Markley's
Spaceship Alphabet.
The complete, decoded message is:
SPACE THE FINAL FRONTIER
THESE ARE THE VOYAGES OF THE CRUISE SHIP FREEDOM OF THE SEAS
HOW LONG IS HER MISSION?
The answer we're looking for is ONE WEEK or SEVEN DAYS.
If this were an actual puzzle, we'd accept any phrase which indicated an equivalent length of time.