If you鈥檙e running sterile nutes there鈥檚 no reason you can鈥檛 push it several weeks. All variables need to be on point, but if they are it won鈥檛 have issues.. if it鈥檚 your first time, it鈥檚 good practice to every week or two.
Oxygenation of water in hydroponic crops is super important; if you don't have a system, you'll need to change and clean it more frequently. Good vibes! 馃憣