Planning a trip from Hartford Ct area to Seldon Island in Lyme Ct

I was wondering if anyone has done this trip? A friend and I are very interested in this trip... I’ve paddled the river in spots, and camped at both Kings Island in Enfield Ct and on Seldon Island in Lyme,Ct... I’m looking for any idea on approximately how long this should take if I were to go in late August early September. Also any other advice web greatly appreciated. Thanks in advance!!! Matt D