User blog comment:Quiksilvr/The date-time synchronisation error and what you can do about it/@comment-26249472-20150802225740

Same rule applies to upgrades, so you can buy and upgrade car at the end o offline play and then login and get shorter delivery/upgrade times.... just noticed it now when I buyed sls amg and started upgrades, 30 minutes was reduced to 10 minutes after log-in ;-)