Our body has very complex mechanizm, i think you sperfishing and asking when? if you get a strong meal at dinner , fish, rice and mineral water and more water and some sweet...
the proses works like this, your liver sentesis glokoz(sugar) to glogejen and store it in your liver,when needed sentesis from glogejen to glokoz to use it..it is smiliar like this , body store it and use it
it does not give you any idea how long you can stay in water, depends on your activity in water, depends on your metobolizm ,depends on water temparature, depends on your sleep well , depends on hundered parameters etc... if you have a good sense mechanizm you can easily know when to stop, i just give you where you get easily by natural way or you can also get from chemical ways(pills) but chemicals consist of toxic and reduce your liver performance for a while, liver throw away toxic from your body when you get natural way , your liver will be happy, too
my eng is bla bla, hope you get what i mean sory!rofl