I wish JaliscoKid wasn't banned he would agree with what I'm about to drop.
Day1....2 hour burn
Day2.....(the very next day) 1 hour burn
Day3....(the very next day) 1 hour burn
then burn 1 hour every 3 days for 2 consecutive days.
It's up to you to decide how far into flowering would be safe to use sulfur.
Watch out for leaf burn...if things look burned at all, cut back on the multiple burns and go back to one burn every 3 days.
You should be golden, just don't use a neem product at all in conjunction with sulfur, which by the way is an essential mineral.