At room temperature GH will degrade faster than in fridge.
That's pretty universal statement.
Now the rate varies a lot.
Some products the difference is not really too meaningful, as the right preservatives and containers are used, with other products they get fucked at twice the rate faster than properly preserved ones at room temp.
Anyway, any GH should last two days at normal room temp. Most will be usable without concern for up to 4-5 days.
Not sure if I make sense, I've been pulling an all nighter. Feel free to ask me to specify.