My wife and I have ridden the TAT (Sams routes) a couple of times, the NC to CO is an easy ride (great scenery but nothing really difficult!, CO to OR is a lot more challenging!) 10 days is okay if as stated the weather is reasonable and you don’t have any break downs or want to go sight seeing). if you allow 10 days you are looking at 180 to 220 miles per day, which is a longish day on dirt, usually about 7 to 9 hours riding per day. This will not allow any time to go and visit attractions in surrounding areas. We took 10 days the first time we rode it, riding every day, the second time we allowed 4 extra days for relaxing and sight seeing. Both plans work well, but be sure to carry some spare parts as minor mechanical issues (punctures, broken cables or wires) can use a lot of time to fix!! Most importantly have fun and dont be **** bent on getting to every way point each day, be prepared to be flexible with your planning, ride a bit less some days, a bit more other days. We camped for 2 days and found a hotel every third day to wash and clean up. We didn’t book anything in advance as we didn’t know where we would be at the end of each day, it’s really easy if you have a mobile phone with you, towards the end of each day, use it to search for a gas station or hotel and just turn up, we never had any trouble finding a room for the night..
remember it’s a vacation, not a race, be prepared to stop a bit and smell the roses!!
Gary