It typically takes 24-48 hours for changes made within an MLS that feeds information to Trulia to filter through on the site.
If the home is actively on the market, that should happen within a few days, or your agent can manually edit the information sooner (which, IIRC, will prevent automatic updates in the future).
If the home is not active and for sale, this information will not change.
Joshua Stein, ABRÂ®, e-ProÂ®
Coldwell Banker Preferred â€“ Conshohocken
Office: (610) 828-9558 * Cell: (215) 866-8030
Direct: (484) 270-1165 * Fax: (215) 999-5894
PA License #RS317975