Does anyone know what the half-life of these PEG-MGF sequences are?

PEG-Suc-Tyr-Gln-Pro-Pro-Ser-Thr-Asn-Lys-Asn-Thr-Lys-Ser-Gln-d-Arg-d-Arg-Lys-Gly-Ser-Thr-Phe-Glu-Glu-His-Lys-NH2


PEG-Suc-Tyr-Gln-Pro-Pro-Ser-Thr-Asn-Lys-Asn-Thr-Lys-Ser-Gln-d-Arg-d-Arg-Lys-Gly-Ser-Thr-Phe-Glu-Glu-d-Arg-Lys-NH2