Commonly, one hour once daily suffices.

I was at one time in the habit of suspending the use of both massage and electricity during menstruation, because I found occasionally that these agents disturbed or checked the normal flow.

Of late, however, I continue to employ both agents, but confine them to the limbs.

I have met with rare cases in which almost any massage gave rise to a uterine hemorrhage, and in which the utmost caution became necessary.
Women who have a sensitive abdominal surface or ovarian tenderness have of course to be handled with care, but in a few days a practised rubber will by degrees intrude upon the tender regions, and will end by kneading them with all desirable force.

The same remarks apply to the spine when it is hurt by a touch; and it is very rare indeed to find persons whose irritable spots cannot at last be rubbed and kneaded to their permanent profit.
Sometimes when the patient is found to be much exhausted by massage, it is well to give some stimulating concentrated food afterwards; occasionally it may be necessary both before and after.