apparently 4 per day - but I would think that 14 per day would be the minimum as I am on 18 per day and I am still allowed to save 4 without it causing me any harm.
Hmmmm so it's either 14 or 16... will check it out....BUT I have never realised it's only 4 a day you can save.
Last time I did this I sometimes saved 10! Ooooops!