data roaming bolt on

[TokyoBlade]

from this o2.co.uk website: "The Bolt Ons last for over 30 days. The Bolt Ons last for over 30 days, so you don’t need to use all your data in a day or a week"

30 days and a second is over 30 days. So is a million years. I need to know if there is a time limit on my data usage, specifically if i need to re-buy in, say, 31 days or if can use the bolt-on until i use up the data.

[MI5]

@TokyoBlade 

It lasts until used and if not fully used in the first month it will roll over for one further month, or until used in the second month.