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

Input:
Question: How long can the flame burn on a "full tank" of butane?
Document: Easy to use. Lasts long enough on a full tank to do at least 40 cr&egrave;me brulees. Would buy again.
I spent a little more on this one but couldnt be happier. its really powerful has an incredible flame. very adjustable and easy to use. saw some people complain about it not lighting and hard to refill. but it is very dependable i use it daily for long periods of time it never fails. you do have to refill it quite often as the tank can only take about 3 or 4 seconds of butane injection (not much at all) but it does make good use of the little gas it takes. sometimes it'll last along time on one refill.
Whenever someone comes into my kitchen they inevitably pick up this torch and fire it up. That look in their eyes, is almost like when cavemen first discovered they have tamed fire on a stick torch. (see what I did there? )I use the torch for sous vide and creme brulee. It works well for home use, as the capacity of the tank isn't big enough for full-on restaurants. Because of that, I like this as it is easy to handle and twist and turn as it doesn't have a huge canister underneath it.Mine didn't come with any fuel in it, so I had to go to the convenience store to buy some butane fuel for cigarette lighters.
I bought this torch to carmelize my creme brulee. It works perfectly! Make sure not to overfill it with butane or you will have a flame thrower until you burn the extra off!
But, I am using it to burn things at a high temperature. It works very well and is dependable. It seems to last a long time.
I hate writing negative reviews and I'm usually mechanically inclined... but... I had a really hard time getting this torch to work. I bought a small container of Zippo butane. I could easily get it to match up with the filling hole, but I always ended up spilling a lot more than went in. My wife did too. I tried the "pumping" action suggested by the directions, too.When I finally did get it full (after spilling A LOT), I found that it was very easy to start the flame and control how much flame I needed.
The fuel indicator shows that it is full. I eventually get the crust I am looking for on the Creme Brulee, but it takes entirely too long.
That would be true of any handheld torch.I thought refilling was quite easy, although I also felt like the butane that was in the torch lasted a long time. (I bought butane in the welding section of a certain big box home improvement store with an orange sign out front.) I also found adjusting the flame to be quite easy.Getting one of these to light was a bit tricky for me at first, but someone in the lab showed me how (I am not one to read directions, I will admit) and I am able to light mine on the first or second try every time.
Works great! Nothing wrong with the product what-so-ever, you get what they say you get for a great price. The fuel tank runs out quick but it doesnt take mu butane to refill which is very nice. Exactly like a Vector torch without the lifetime warranty.
Got this to make creme brulee. It was inexpensive, but easy to use. Honestly, I couldn't be bothered to figure out how to put the butane in, but my sweet husband made it work. All I had to do, was point and burn! The creme brulee was tastey and the torch worked! Would recommend.
Answer: A good ten minutes on full blast