In guide:
Exploration Ship
To colonize uninhabited worlds, exploration ships are used. They are filled with colonists seeking a fresh start. They also typically have very poor defenses. Because of not having enough volunteers for such a dangerous mission, you can only build up to 6 exploration ships a day. You can send your exploration ships by clicking on an empty planet on the map.

It should be:
Exploration Ship
To colonize uninhabited worlds, exploration ships are used. They are filled with colonists seeking a fresh start. They also typically have very poor defenses. Because of not having enough volunteers for such a dangerous mission only 8 exploration ships can be in creation at the same time. Due to preparation of the built site, after 24 hours a new built slots will come avaiable every tick. You can send your exploration ships by clicking on an empty planet on the map.

Why this addition:
At the moment you can built 8 expo's at SOR (atleast in SN).
After 24 ticks you can built one more
After 25 ticks you can built one more
etc, until you hit tick 32.

If you are always online you can built 8 expo's a day (queue when it gets available). If you only built them when you can built 8 expo's at once you will have lost 28 regeneration ticks (1+2+3+4+5+6+7). This will result in building on avarage 1,15 less expo's a day (28 ticks /24 ticks).

Conclusion. If you built expo's directly, you can built 8 a day. If you let them queue you will drop below 7,85 a day. Thats over 14% less expo's all round.