Funny thing is the show runners actually went to the trouble of correcting the in The Sea Devils. So have to give them props for that.
'Eocenes' being the proper name.
Hiding in the Tardis:
Problem was, the Tardis looke dlike it was about a mile away. Wasn't really time to herd everyone over there and still deal with the approaching enemies.
Time it took to set up the system:
Yeah, that bugged me a little too. But I just chalked it up to 'tv time'. Tons of shows seem to do it.