How long does an oxycotin stay in your system?

If u have not done an oxy for about 5 months and did about 2-3 of them recently ok what it is , is my friend did 2 40mg oxy on thursday and has a urine test and maybe blood test don't on tuesday the 31st will it show up or no because of the low amout of does she did.And isn't it out of your system in 4-7 days or could it be sooner cause she did only 2 and i think she did 3 percs to not sure but will it show up n what can she drink or do to try to get it out of her system be for tuesday morning