How long to fly to Dubai from Vancouver with a connection in Toronto?

A random search for flights Dubai (DXB) to Vancouver (YVR) shows: OPTION 1: 23hr 34 min via London Heathrow (LHR) & Toronto Intl (YYZ)

DXB - LHR British Airways Flt 108 Dep 09:35am 23Jul,Thu

LHR - YYZ British Airways Flt 099 Dep 03:35pm 23Jul,Thu

YYZ - YVR Air Canada Flt 1169 Dep 08:00pm 23Jul,Thu

Flight Duration: 20hr 19min; Layover Time: 3hr 15min; Total Trip Time: 23hr 34min

1-way Economy fare US$939.oo + Taxes & Fees US$163.oo OPTION 2: 20hr 00min via London Heathrow (LHR)

DXB - LHR British Airways Flt 108 Dep 09:35am 23Jul,Thu

LHR - YVR British Airways Flt 085 Dep 05:10pm 23Jul,Thu

Flight Duration: 16hr 55min; Layover Time: 3hr 05min; Total Trip Time: 20hr 00min

1-way Economy fare US$1,016.oo + Taxes & Fees US$78.oo