What chain and padlock have you got? Like I said the almax website is very eye opening, most well known chains can be bolt cropped in a matter of seconds.
The only chain out there that is bolt crop proof is ..... the almax.
Chains are a total waste of time unless they are used to lock your bike to something secure, is there no street furniture you could lock to. Otherwise your bike will be into a van and away.
Unless you buy a good anchor, padlock and chain, then I'm sorry to say, in my view it's all a bit of a waste of time. You'll be better off fitting a tracker so you can find it afterwards, on that score look up Squanto. Discussed at great length in another post, and highly recommended.
https://www.squanto.co.ukBuy one, and an almax padlock, chain, and anchor then you might actually get some sleep at night..