Self-bondage.

Or bondage for singles...

It is of the utmost importance that you've got someone who can intervene ( and rescue you ) in case that things go wrong.
Call your friend, and make the agreement, that he/she will come to your place, and free you, if you havent called him/her at 9AM next morning ( And remember to make sure that your friend can get into you home, if you're bound to the coffetable, with a dildo inside your rubber pants ). 
The short edition goes like this : In case your "release maneuver" fails, you'll end up dying from starvation, 15 feet from a full refrigerator.
Even the most careful plots fail every once and awhile... ( If NASA can screw up, why should you be immune ? ).

There are a series of 'delay mechanisms' that you can apply in order to delay your release from i.e. a pair of handcuffs.

• Hang your handcuff key in the middle of an empty orange-juice-plastic-bottle, in a thin line, fill the bottle with water, and freeze it. .
  When you need to have a delayed release from your handcuffs, you take out the bottle, remove the cap, and place it in your kitchen sink. This will leave you in a situation, where you can put on your handcuffs, lock them, and then you'll have to wait until the ice has thawed so much, that it releases the key.
  NB: Do NOT forget to close the drain, as it's extremely difficult to disassemble the drainpipes, when handcuffed - and the key LOVES that little opening in your kitchen sink 
  
• Ice-lock: You'll need an empty plastic bottle, two shoe-laces, water and a freezer.
  Bind the ends of either shoelace together, so that you get two nooses, which are NOT bound together.
  Put the knotted ends of the shoelaces into the bottle, so that you have app. 1" of either loop, out of the bottle.
  Fill the bottle 75% with water. You might find it handy to secure the two loops, around the bottleneck, with a rubber-band, to prevent them from falling into the bottle.
  Make sure, that the two knots, are at the bottom, of the bottle.
  Freeze the bottle, til the water has solidified.
  Now you can tie the one loop, i.e. to your bed, and the other one i.e. to your collar - this will leave you in a situation, where you'll need to wait for the ice to thaw, before you can pull the loops out of the bottle, and get away (i.e. to get to your keys, or...).

• Put a good candle in a heavy chandelier, and find a spot where you'll be unable to get at it while handcuffed.
  Bind a sewing thread around the candle, and place the candle in the spot you've just selected
  Pull the sewing thread through the hook, that you've got in the ceiling anyway, and tie you handcuff key to it, 7 feet above the floor
  Insert a buzzing dildo, put on a pair of bondage panties, and make sure, that the dildo stay where it's been put.
  Light the candle, put on your handcuffs, and enjoy enjoy...
  As the flame reaches the sewing thread, it will burn it, ant then the key to your handcuffs will drop to the floor, where yoou can get at it. ( Consider using a semi-heavy key ring, to secure that the key IS falling to the floor ).  
  !   Put the candle in a draught-secure place, otherwise you might end up waiting for a loong time, if the draught blow out the candle ).
  
• Put your handcuff key into an heavy-duty envelope, add a stamp + your name and address, throw the envelope into the mailbox.
  At a suitable time, i.e. 4 hours before the usual mail-delivery, you put on your latex tights, along with a buzzing dildo, secure the whole thing with a bondage panty, and put on your handcuffs.
  Now all you'll have to do, is to wait for the mail to arrive...
  !   In case you've got your mailbox at the roadside, consider another delay-mechanism...
  
• Hang your handcuff key from a bush in the backyard / in the park / in the fence at the railway.
  Go home, and dress up in a bondage bra, a pair of bondage panties, and put on your handcuffs.
  Now you'll need to pick up the key, more or less naked, before you can get out of the handcuffs.
  If you put the key in a public place, you may put a a rain cape on top of the bondage, to leave the general impression that you're dressed
  !   Remember to hide the key a little, it's tough shit, if it's missing, when you get there...