Every snake drops a duce on it own time. There is no magic formula or schedule. Some of mine go weekly, and one of mine goes about ever shed or 6 weeks, which ever comes first.

You should feed on a regular schedule regardless of how often they go. Waiting to feed until after a B/M is a sure way to throw them off feed, or to underfeed them.

Just provide plenty of fresh water, and offer food on a regular schedule. They will go when they need to.