When we started pat/shush at 5-6 weeks, there was a lot of crying. Usually about 20 minutes or so, but I would have to keep patting until she was deeply asleep and sometimes for the entire nap for that first week or two of sleep training. She alternate between really screaming and more quiet crying before dropping off.
Some babies might be more persistent with crying--it depends on A times, how tired they are, how long and persistent you've been with sleep training, and their own personality.
A times for us were about 45 minutes at 6 weeks, and not a lot of stimulation or electronic toys/music. Getting the A times right and avoiding overstimulation really helped cut down on the crying. At that age they just can't process it.