Plan was 6 CCW from Concord so I could have car to allow changes in gear. there was a final loop of ~12 miles planned to get to 100 - adjusted for trips to Dunkin Donuts and New London. I THOUGHT SUNSET AT ~5:10 PM - ACTUALLY AT 4:22 - DIDN'T FIND THAT OUT UNTIL 12/30 MONDAY Parked at bank on Lowell Rd, near the start point just out of town on Lowell Road. Around mile 60 there was a lot more coasting - cadence dropped to 0. I had no real-time cadence input except noise of pant legs. Originally planned final "10" miles to be out to Carlisle and back - but was too tired for that, so went in the other direction - from Concord Center towards Bedford on Lexington Rd. Ran out of light - will get final 2.5 miles tomorrow before 7:30 AM to complete century in 24 hour period. The Garmin G1030 had recently updated. I had it in INDOOR mode and was unaware why I had lost connection to my cadence, speed. heart rate, etc. From G1030, temps never got higher than 37! Twice ran into Bob Wolf, Greg Stathis and Dr. Frank doing an FAIB ride. ON 12/30 MONDAY RODE 4.5 MILES IN EARLY AM IN LINCOLN - SO WITHIN 24 HOURS OF RIDE START This was Century # 298 - The actual metrics on this posting are original. The second portion metrics on 12/30/19 are listed with that ride. The century timing is shown below 12/29 97.6889 7:40:41 duration 9:40:47 start 07:24 AM timer - actually moving at 7:34 12/30 4.4814 0:25:56 31.20 end 07:29 for 102.2 miles, century about 10 minutes earlier NOTE: PROBLEM WITH RIGHT SHOE NOT STAYING CLIPPED IN - last 5-6 miles day 1 - 2 days later discovered that the rubber sole of the shoe cover boot had slipped over the cleat preventing clip in.