povedala by som ze dost dlho, praveze na -20 budu stabilne
DNA a bielkoviny sa bezne skladuju na -20/-80

virusy nie su ako bunkove patogeny (bakterie, prvoky), ze je mozne ich "vymrazit" (vdaka vode v bunkach, ktora zmrazenim a rozpinanim potrha bunkove strunktury)

nenasla som lepsiu referenciu, ale vzorky na testovanie sa v pripade dlhsieho delay zjavne posielaju zmrazene: Send to the laboratory as soon as possible. Sample may be stored at 2-8°C for up to 72 hours of collection. Ship immediately to lab at 2-8°C (ice pack). If collection to receipt in the lab will exceed 72 hours freeze at -10°C or colder and ship on dry ice. Do not freeze/thaw. [ https://testguide.labmed.uw.edu/public/view/NCVQLT?tabs=no ]

tip: rozmrazuj tesne pred pouzitim v rure, teplota/cas podla odporucani

edit: details