On average how long does a colonoscopy and endoscopy done at the same time take? Will the sedation cause funny behavior after like anesthesia does?

Short sedation. EGD (upper endoscopy) can be as short as 5 minutes, with biposies most of them accopmlished in ~15 min. Colonoscopy takes longer, most fit in the timeframe of 20-40 minutes. The sedation used for the procedure is quite deep usually and approaches/equals Total Intravenous Anesthesia, TIVA. Due to nature of the drug (s) used the recovery may vary but usually is pretty fast and free of side effects.