Generally it is three years.
"In most cases when the doctrine of unjust enrichment is involed RSMo 516.120, a five-year statute of limitation, is applicable." 35 MOPRAC § 44:5
Unjust enrichment refers to a situation where one party has received a benefit or payment that they are not entitled to, usually at the expense of another party. It often leads to legal claims or actions seeking to recover the unjustly gained benefit.
Unjust enrichment is when a party wrongfully profits from a breach in contract. The contractual remedy is restitution during which the innocent party will receive the damages of the contract along with the unjust enrichments of the breaching party.
unjust enrichment
Horst Heinrich Jakobs has written: 'Magna Glossa' -- subject(s): Medieval Law, Roman law 'Lucrum ex negotiatione' -- subject(s): History, Unjust enrichment, Unjust enrichment (Roman law)
George E. Palmer has written: '2007 Cumulative Supplement No.1 Law of Restitution (Volumes I-IV)' 'Law of Restitution, 2002-2 Cumulative Supplement' 'Mistake and unjust enrichment' -- subject(s): Mistake (Law), Unjust enrichment
Ross Grantham has written: 'Restitution' -- subject(s): Restitution, Unjust enrichment
D. P. Visser has written: 'Daedalus in the Supreme Court' 'Thinking about law' -- subject(s): Law, Jurisprudence, Roman law, History 'Unjustified enrichment' -- subject(s): Unjust enrichment
Laurent Olivier Gilliard has written: 'La disparition de l'enrichissement' -- subject(s): Unjust enrichment
In Swiss law, there are three main sources of obligation: contract, tort and unjust enrichment. There are also various obligations stemming from the law itself, such as alimony.
One of the critical affirmative defenses would be the voluntary payment doctrine. Check to see if this doctrine is available in your jurisdiction.
Antonio Janner has written: 'Wandlungen der Bereicherungslehre im schweizerischen Recht' -- subject(s): Consideration (Law), Unjust enrichment