Covenant

     A covenant is a binding agreement between two or more parties where each party is held to their word, whether verbal or written.  The caster draws an illuminated circle in the air and the spell binds the parties as long as they are within 60ft of each other and can either see or hear the covenant made.  The covenant has up to 48 hours to be fulfilled or the parties, whichever are unable to perform their end of the covenant, and not due to pro-quo, begin making Wis saving throws each day at dawn; the saves have disadvantage if the covenant was cast while parties are touching such as a handshake or a signature.  On a failed save the party takes a -1 permanent penalty to their Wisdom score.  These saves continue indefinably, until the covenant is dispelled(all parties must be dispelled at the same time), death, or until the covenant has been fulfilled.

 P.S. A covenant cannot bind anyone to an impossible task or one that cannot be accomplished in the given time.

At higher levels the spells duration can be increased:

     -4th level: 1 week (7 days)
     -5th level: 1 month (30 days)
     -6th level: 3 months (90 days)
     -7th level: 6 months (180 days)
     -8th level: 9 months (240 days)
     -9th level: 12 months (365 days)