ligence throughout the period he [sought] to toll."' Walker v. Jastremski, 430 F.3d 560, 564 (2d Cir. 2005) (third alteration in original) (quoting Doe v. Menefee, 391 F.3d 147, 159 (2d Cir. 2004)) ... "Generally, a litigant seeking equitable tolling bears the burden of establishing two elements: (1) that he