@mostapha or any of the other Radiance gurus on the forum would be able to help you better than I but I know that support for smaller timesteps in legacy honeybee is limited and, if you need an annual daylight simulation at a finer timesteps, you should really be using Honeybee[+]. I know that the core libraries of HB[+] are all set up for finer timesteps and you will even see that the Ladybug[+] AnalysisPeriod has an input for timestep (I don’t think that what you have done here with the AnalysisPeriod will work). Also, as a good practice, you should probably break out your question about accelerad into another discussion topic.