How long can mixed nutrients last?

[CreatureCannabis]

Hi, first grow going on here and about to start actually feeding the ladies. I'm using Biobizz Light Mix soil as well as the Biobizz Starter Pack line of nutrients. I have 3 autoflowers in 5 gal fabric pots, and since they're just out of the seedling phase, they're only getting about a cup and half of water. if i mix the first "week" of nutrients (basically a root stimulator) and only use a few cups, can I use a few more cups on the next watering in two days?

[9fingerleafs]

Im sure two days its fine

[ChadWestport]

Are you aerating the mix with air-stones? If I leave my nutrients out for any period of time, I prefer to have air stones to keep the solution mixed thoroughly. I try not to go past 24 hour, but 48 has happened.