Stockholm (AFP) - Sweden's sexual assault inquiry on Julian Assange is being pinched by time, with the statute of limitations about to expire on one charge and investigators unable to access Ecuador's embassy in London to question the WikiLeaks founder.Swedish prosecutors petitioned the Ecuadorian embassy in June to interview Assange, who has been holed up in Quito's London mission since 2012 to avoid extradition to Sweden on allegations of rape and sexual assault -- charges Assange vehemently denies.But access has thus far been delayed on procedural grounds, leading some people involved in the case to suspect Ecuador of playing the clock until mid-August, when the statute of limitations on the sexual assault accusation will expire."I am very critical of Ecuador's position.