I imagine that Jorge has the times. I did find that Clay Harmon posted the following times for 1.5-3-100 dilution. SBR 6----16 minutes
SBR 7----10 minutes
SBR 9----8 minutes
SBR 11---5.5 minutes

These are for a density range of 1.4. Should be fairly close to what you want. Good luck.