Can I continually add to the bin or is there a cut off time for the contents to compost fully?

There is no cut off time. Composting is a continual process; you put in at the top and take away the finished compost at the bottom. If the amount in your bin is reducing, its working!

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Problems with your compost?

What should I put at the bottom of the compost bin?

Generally speaking it is not essential to add anything in particular to the bottom a compost bin.... read on
Our compost looks like it has all turned to mush. What can we do?

Most likely, all the fruit and vegetable peelings that have been added to you bin have not been p... read on
I don't have a garden or any outdoor space. Can I compost indoors?

Unfortunately, it is difficult to compost if you are without an outdoor space. In theory, wormer... read on