It's 11.5-12 hour drive from Watson to Lemoyne and all reports say he wasn't even there as yet.
http://effinghamdailynews.com/local/x1253341780/Grandfather-fears-granddaughter-abducted
if it was "while hauling" then clearly he had not yet arrived.
I DO vaguely remember reading (somewhere) that they left on Saturday to Lemoyne...but that makes no sense if they hadn't gotten there STILL by the following day. Well...unless they left late at night Saturday IE: after an accident that ended in death in order to corroborate a storyline (cough).
If mom put the missing child call in at 10:49am (the time Sheriff Monnet indicates in his interview)
Effingham County Sheriff John Monnet talks about missing 7-year old Watson Girl - YouTube "
10:49 this morning"
...even if Ciara called dada around 11am (RIGHT after the 911 call)... 11am he was still hauling a load to a place that is 11.5 hours away? Midnight/11pm Saturday night is when they would have had to leave to get to Lemoyne...but he wasn't there yet when he was called because it says he got the call "while he was hauling".
To answer your question though...it hasn't been said what time they left.