It depends, if you are referring to the pastry cream/whipped cream mixture piped inside the choux paste, or something else. If you're making eclairs or cream puffs, they should last a few days in the fridge.
The main "secret" to making choux pastry is to have the batter hot enough to partially cook the eggs as you add them when mixing. I always added room temperature eggs one at a time and add the next one as soon as possible to avoid the hot dough from cooling too much. At the end of the egg adding process it will be cooled down but as long as the first eggs are added when the dough is hot, you will be ok.
Yes, most types of pastry dough keep well overnight, as long as they are wrapped air-tight.
A long time
Weed stays fresh for a long time. You can put it in a plastic bag to keep it fresh for a long time or you can also freeze it.
keep it in the refrigerator, and when you take it out, you can put it in a toaster or toaster oven
3 months
3 weeks
12/18 hours
It gets invaded by bacteria.
2 days
12 to 16 days from fresh with juicer