Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: How long to recharge
Document: It is slightly bulky but still very portable. Holds a massive amount of power but takes a long time to recharge.
For that reason, you'll want to get a high-capacity (2.1A) USB wall charger to plug into. It can recharge via the USB port in your computer, but this would take a very long time to get a full charge.
This is great, all of the power you need and now it is perfect for the outdoors, great for the recharge on the ski slopes and the day long meetings. The size is a little big to slid in your back pocket, so I carry this on in my backpack. It is a lot more durable. If there are any changes I will update this later.
The battery pack took around 7.5 hours to fully recharge each time I drained it. It does seem like a long time, but you really do get a lot out of a single charge.~Side Notes~: The battery pack does NOT come with a wall charger or any proprietary charging cables (iPad, iPhone, Galaxy tabs, etc).
The Powerpack is the best accessory I have ever had. I spend long days at work and listen to music the whole time which really drains my phone battery. The Powerpack works quickly to recharge my phone and can be used multiple days without needing to be recharged itself. The Powerpack also charges my ipad as quick at the wall charger which is great.
I charged it up fully when I got it before using it. Since then I have used it to charge my iPad Mini and my iPhone twice each and have only lost one light (out of 4) on the charger - I have no idea how many more times I'll be able to recharge my "toys" before I need to charge the charger again! Very happy - long plane trips and long layovers no longer worry me.
Over the course of our search I never had to recharge the PowerPak - which was handy because we were never in one place very long. At the end of day four we found our dog (we are so thankful). Without a doubt we would not have had the same results if it wasn't for having the continuous use of our smartphones.On a side note, last fall I purchased a much cheaper charger (Groupon - I think it was $19) - with only one port and not much power.
The New Trent PowerPak Xtreme (NT120R) is a one of a kind portable charger. I have found that the battery lasts quite a while on it. I took it with me the past weekend on a road trip and for 4 days, I was able to keep my phone and Ipad charged with no problems. Its unique design makes it durable and fashionable as well. The only issue I have with it is that it takes a long time to recharge the battery. This is a great product.
I've had this charger for a while. It's come in handy when I'm not near an outlet. I've used it with my Android phone, iPad, iPad keyboard, and EMS/Fire Pager. The results were great and it charges my stuff well. I was surprised how long the charger lasted before needing a recharge. It fits well in my trauma pack as well as my traditional soft briefcase. Holds up to being bounced around, I'm a little rough on my gear.
I have charged this unit twice now and used it to recharge my Galaxy S4, Ipod Touch and a Blackberry phone several times now. Both ports work very well and the device charging time is fantastic. I really like the Xtreme's rugged case and feel like it can hold up well in everyday use and on my camping trips. The recharge time for the Xtreme itself is a little long, but I know that it's because of the awesome capacity.
Answer: When completely dead it is an overnight task.