The turbocharge function allows for up to 300 minutes a month that you are able to turbocharge your account with.
You have the option of using the full 300 minutes at once or you can break it down into either 60 minutes/120 minutes/180 minutes/240 minutes
During peak hours, you are able to download as much torrents as you would like although around these times, you will be shaped due to the congestion on the network or the amount of data you use. The "shaping" redusces your speed thus making it longer to download data.
I hope the above information has been helpful :)
Please have a wonderful day ahead :)