Hi! Many piggies are not all that cuddly, boars more than sows, so don't feel upset! That amount of time is pretty normal.
You can extend that time by allowing them to snuggle under a soft cover on your lap and eventually fall asleep on you, but be aware that a very relaxed piggy will pee, so you will need an absorbent cuddling blanket, too!
Most piggies also don't like being picked up; it cuts too close to their prey animal instincts. You can train your girls to come into a conveyance of some sort, like a tunnel, an upturned hidey or a padded cardboard box with a "door". Place a little treat in the back and start training once they are comfy with the conveyance. Turn the pick up into a ritual with the same words in the same tone all the time, a little veg or grass treat to lure them in and lots of praise. They will hopefully catch on fairly soon, but it may take a few weeks.
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Most of it is a very gradual process that takes much longer than you would expect, but with some patience and persistence, you will get there!