How long should you practise? Well, there's several answers to this, to my mind:

Practising a little every day is essential - on your own, to struggle with the new stuff, is helpful for embedding it. Especially if you are getting it wrong on your own, since that means you are learning how to learn. Never worry about getting stuff wrong, it's  the practise itself that's important - everything will come right in the end if you keep on trying.

Practising in a group is also essential, whether you d...
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