Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: How long does it take to get it charged up to full capacity?
Document: Then I just pop it back in the charger. If you run the battery down completely it takes a couple of hours to recharge but I'm not sure exactly how long for a full recharge. It does both floor and carpet really well and all you have to do is tap the floor/carpet button with your foot. Again, you don't even have to bend down.
We have 3 dogs (one long-haired), hardwood floors, one shag rug and one rug with a high pile. Cleaning our floors normally requires a full sized corded upright vacuum. Most cordless stick can't last long enough to do our small (800 square foot) first floor without running out of juice. The high pile rug and shag rug are impossible to clean with other cordless vacs. I finally broke down and bought the Shark Navigator just to do quick cleanup in the kitchen.
It also has enough juice to both our first floor and second floor one one charge. It has a large dust bin and powerful suction. Pet hair doesn't get tangled in the brushroll. The charging base is easy and uncomplicated: just set the vacuum cleaner in it. It also reaches a full charge in 4 hours, which is nice.
I have 2 other shark products that I love, so I thought I couldn't go wrong with this even though I have friends that love the Hoover Linx. Unfortunately it has been a headache since I bought it less than a year ago. The on-off switch sticks and sometimes it doesn't switch on unless you really press and maneuver the vacuum around. It gets stopped up with hair sometimes, too, and you have to take it apart to get the hair out.
This is a great vac. Its easy to maneuver, has good suction and lasts long enough to get the job done. The one thing that would have made this the perfect vacuum would have been an attachment for edges and corners.
It is rather ugly (Shark needs to take a lesson from Electrolux. )I just hope the battery doesn't give out after six months like it has for some of the reviewers here!
Light weight, easy to use, just wish it lasted a bit longer once it is charged.I recommend it to anyone looking for a cordless model for in between major cleanups.
I've owned this Shark Navigator freestyle 3 months and was very happy with it until recently. Now after fully charged and an attempt to use when turning on it immediately shuts off. Put back on charger for a moment and same thing. Will only turn on once then have to put back on charger to turn on again but same results shuts off in a second.
Batteries died after 35 charges (charged every other day replacement batteries backordered. the estimated ship date has been changed 3 times. it has now not worked longer than it worked. Customer Service is no help. you tell them your problem, they repeat the day they are supposed to be shipped. You state you have heard this before ,they repeat the day they are supposed to be shipped.
I got a refurbished model and the price was awesome. Even at full price, it is a bargain. Easy to use, lightweight and has incredible suction for pet fur, dust, etc. Works well on tile and on carpet. Love that it is cordless.
Answer: I think it takes 3 or 4 hours to charge completely.  I don't wait on it.  I use it in my living room & kitchen, then put it back on the charger until the next day.