Is there a time limit on a VAR review, and can a decision be reviewed after play restarts?

Time: the IFAB protocol sets no maximum time limit for a review, because accuracy of the final decision is more important than speed.

After a restart: if play has stopped and been restarted, the referee may only review a case of mistaken identity, or a potential sending-off offence relating to violent conduct, spitting, biting or extremely offensive, insulting and/or abusive action(s). Restart decisions such as corner kicks and throw-ins cannot be changed once play has restarted, so they cannot be reviewed.

Match validity: a match is not invalidated in principle by a VAR technology malfunction, a wrong decision involving the VAR, a decision not to review, or a review of a non-reviewable decision.

Source: IFAB Laws of the Game 2026/27, VAR protocol https://www.theifab.com/laws/latest/video-assistant-referee-var-protocol/