I started a job 6 months ago. I asked before starting it whether they'd consider offering it at 0.8, they said no, I accepted it full-time. I would really like to go down to 0.9 hours over 4 days - this is quite common at my employer and I am confident that it would be workable for my role. But I'm worried that I'll look cheeky/unreasonable to put in for a slightly amended version of what they said no to six months ago - on the other hand, they didn't know me at all then, and they do now (and I think they consider me a productive worker, I've hit every deadline easily and I've made sure that I've always been flexible about work that might require extra hours to show willing). Any thoughts on this? Is it mad to even think of putting in an application this soon into the job?