I waited a long time before bottling, but only because I went on holiday and had a lot on etc. To mature in bulk it simply gets left under airlock in the secondary. You can do this for as long as you like really. Leaving a brew to mature just gives it time to round off and allow the homebrew twang to dissipate. Very worthwhile IMO.
As for the sugar, approx 5g per pint is about the most I would go with. 160-200g of sugar for a 23L batch won't be far wrong for a sparkling cider. I think I actually bottled mine with 180g and it's perfect for my taste. Anything more would be a bit too fizzy I think.
I wouldn't recommend 2L bottles as with most bottle conditioned fizzy drinks it will lift the sediment from the bottom of the bottle once you finish pouring. With a 2L bottle you're only going to be pouring approx a pint each time, this will mean you will need to leave it for a couple of days after 1 pour, to allow the sediment to fall again.
As for the sugar, approx 5g per pint is about the most I would go with. 160-200g of sugar for a 23L batch won't be far wrong for a sparkling cider. I think I actually bottled mine with 180g and it's perfect for my taste. Anything more would be a bit too fizzy I think.
I wouldn't recommend 2L bottles as with most bottle conditioned fizzy drinks it will lift the sediment from the bottom of the bottle once you finish pouring. With a 2L bottle you're only going to be pouring approx a pint each time, this will mean you will need to leave it for a couple of days after 1 pour, to allow the sediment to fall again.