I have done this the past few years. This year I went for 60 km and was feeling great at 40k so I extended it to 60m and made a wrong turn and ended up doing double in Km at 120km
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72 Geoffery Butler, 72 Gugificatizion Witcomb, 72 Raleigh Gran Sport SS, 74 Raleigh GrandPrix dingle speed, 74 Raleigh international, 81 Centurion Pro-Tour, 85 Gazelle Primeur, 29rBMX, Surley Steamroller 650b