How long did it take you to decide to sell your car

Been kicking around the possibility of selling my sort of 74 Scamp that has had many changes through the 25 years of ownership. Just don't drive it much anymore and enjoy it like I use to. Into trucks now love my 72 C10 and just bought a 50 Studebaker R2-5. How much agonizing time did it take you to finally decide to sell your pride also how did you come up with a fair price. Liking old and slow like me