Day 17. I left out the intervening days as I was busy but within 3 weeks my nodule has gone but I can feel a slight raised edge. At about day 12 perhaps, the nodule actually came to a head and after cleansing in the shower, it opened up (i.e. started weeping slightly) so I just very gently applied a tiny bit of pressure and most of the pus came out. But I would NEVER recommend this action if you haven't got a head that has just started.
Basically if the pus comes out easily without any real pressure and no blood, then it can heal nicely. Blood is not in general a good thing, though it cannot be always avoided particularly if the nodule is deep (I get these)
After the pus came out, I just put the sudocrem on to let it heal. After healing I think re-added the panoxyl to the routine.