what kinda set up? I'm assuming soil. if so, what kind? With organic soils you can usually wait until the 3-4 week period without nutes.
ok..those take just regular water for a while (bout a week or two).. it still depends on what type of soil your going to put the plug into.. Right now you can get a 12 qt bag of Fox Farms Ocean Forrest for just a lil more than 6 dollars (before shipping) at GrowSmart just go down the menu till you see 'growing medium'. That soil can sustain plant life for about a 3-4 weeks before you have to give nutes at all.. and to put into perspective as to how good it is. Its the tippy top dog.. Every soil grower who's ever used it, swears by it. Including me :'>
You question was answered by the above. Your soil should have all the nutes you need for 3-4 weeks. After that the plant exhausts them usually and you start adding nutes to your water.