I think your wife should allow you to cum as soon as your time period is over but she should put a "timer" on how long it takes you to shoot. For every hour that passes that you don't orgasm in the following 24-hour period will equal another day in chastity!
The rules for your "orgasm":
1) You WILL NOT touch your body in any manner to cause you to orgasm.
2) You WILL NOT put your body in any motion against another object or person to cause you to orgasm.
3) You WILL only be allowed to orgasm thru the act of anal penetration by a complete stranger (wife/family/friends/coworkers/anyone who you've met previously are all OFF LIMITS). The only thing which will be allowed in your asshole will be strap-on dildos or cocks. You WILL seek out each anal penetration without the assistance of anyone else. Your wife WILL approve each penetration for its "size and length" and determine if the penetration has caused you to orgasm. Each anal penetration will performed ONLY once per act. You WILL go somewhere else if any particular penetration doesn't achieve an orgasm which your wife deems appropriate. Animals are permitted to be used.
4) You WILL be completely naked during the entire 24-hour period that you are on the "clock" and your wrists and arms will be secured behind your back for the entire 24-hours.
5) Once it has been determined how long you're next chastity period will be, each day you are in chastity, you WILL accept the spanking of your bare ass by a "friendly" (wife/family/friends/coworkers/anyone who you've met previously are all acceptable) thru the use of a leather strap or wooden paddle. You WILL be spanked continuously for a time period, in minutes, equal to the amount of hours it took you to orgasm (or didn't orgasm). Your wife will determine the individual, location, instrument and approve of the the ferocity of each strike. Each day WILL require a different individual, location and instrument -- an individual or location WILL NOT be duplicated during the entire chastity period!
Have "fun" and post a report of your "quest" for an orgasm plus a report of each day on your new chastity period to include daily pictures of ALL involved!