A Veet burn will last for around 3 to 10 days depending on how bad the Veet burn is.
When you have a Veet burn it's a chemical burn from the chemicals that are in the Veet which makes the Veet work so well.
To treat a Veet chemical burn wash the Veet off your skin using some soap and water and irrigate the Veet burn for a few minutes.
Then as the Veet burn is healing you should apply some topical antibiotic such as bacitracin or polysporin to the burn.
And within 3 to 10 days of applying the topical antibiotic the Veet burn should heal.
When using Veet make sure to wash the Veet off your skin after you're done to avoid a chemical burn and also don't keep the Veet on your skin longer than neeed.
Leaving the Veet on your skin too long is what causes the chemical burns.
Veet is safe to use on your skin when used correctly.