Saving Libraries While Active, SAVACT parm value

["Westdorp, Tom" <Tom.Westdorp@xxxxxxxxxxxxxxxxxx>]

I need to save a large (~175) number of large libraries for three
interconnected applications.  Downtime is limited, but I can get a couple of
hours.  This means I need to do a save while active, getting a sync point
while the apps are quiesced and then letting the users back in while the
save to tape completes.  Trying this with the parameter value
SAVACT(*SYNCLIB) took a prohibitively long time.  

Since the applications are quiesced will SAVACT(*SYSDEFN) set the same sync
point set for all libraries and get them all saved as of the same point in
time?