When putting a cycle together its important to know the Half life of the substances that you are taking
Here is a list of (most of them) Good luck on your Journey!

I have also added several items that were missing.. if you know of anything i missed comment below and ill

add it into the list.. Thanks guys

Oral steroids Drug Active half-life
Anadrol / Anapolan50 (oxymetholone) 8 to 9 hours
Anavar (oxandrolone) 9 hours
(Tbol) Chlorodehydromethyltestosterone16 hours
Dianabol (methandrostenolone , methandienone) 4.5 to 6 hours
Halotestin (Fluoxymesteron)( Halo ) 6-8 hours
Methyltrienolone (oral Tren) 4-6 hours
Winstrol (stanozolol )
(tablets or depot taken orally) 9 hours

Depot steroids Drug Active half-life
Deca -durabolin (Nandrolone decanate) 14 days
Equipoise 14 days
Finaject (trenbolone acetate) 1 day
Primobolan (methenolone enanthate) 10.5 days
Sustanon or Omnadren 15 to 18 days
Testosterone Cypionate 12 days
Testosterone Enanthate 10.5 days
Testosterone Propionate 2 days
Testosterone Suspension 1 day
Winstrol (stanozolol) 1 day

Steroid esters Drug Active half-life
Formate 1.5 days
Acetate 1 day
Propionate 2 days
Phenylpropionate 4.5 days
Butyrate 6 days
Valerate 7.5 days
Hexanoate 9 days
Caproate 9 days
Isocaproate 9 days
Heptanoate 10.5 days
Enanthate 10.5 days
Octanoate 12 days
Cypionate 12 days
Nonanoate 13.5 days
Decanoate 15 days
Undecanoate 16.5 days

*Clenbuterol 1.5 days
T3 10 hours

Ancillaries Drug Active half-life
Arimidex 3 days
cabergoline 63-68 Hours
Clomid 5 days
Cytadren 6 hours
Exemestane ( Aromasin) 24 Hours
Letrozole 2 days
Proviron (Mesterolone) 12-13 hours
Tamoxifen (Nolva) 7-14 Hours

http://www.british-bodybuilding.co.uk/Half-Life.shtml