I go for Tokyo Marathon too, and this is my second time. last year result is 3hr 44mins and it was too cold - 30km time was only 2hr 30mins but the rest 12.195km, I need to take 1hr 14mins\, totally collapsed due to extreme cold temp - starting time was only 3"C and when I finished the temp was only 7 to 8"c only and also strong North West wind and no sunshine
Hope this year the weather is better !!!
I finsihed the HKSCM at 3hr 38mins this year and hope to PB this time !!!