That sounds a little slow for six ounces of milk with most prosumer class HX espresso machines. You can get more ommph by forcing the heating element prior to steaming. That is, purge the wand until the heating element comes on, cut off the steam for an instant to dunk the tip in the milk, then open it again just before the heating element turns off.
I believe you have a Quickmill Vetrano; the
Steaming Performance section includes its times for 8, 10, and 12 ounces. It should be under 30 seconds for six ounces.