Getting into Delhi ncr takes and needed much more time as compared to getting out of same Delhi ncr.
Aap khud dekh lijiye , for example:
Delhi-Gurgaon Highway le lo or else Mumbai-Pune expressway le lo. Agar aap Gaadi drive karte huye aayenge from Mumbai to Pune then aapko bahut less time lagega due to less traffic congestion while GETTING OUT of the Metro. But while return journey Aapko jyada time lag jayega, bcoz Traffic jyada rahega and many vehicles try to ENTER at a time into the city.
Same...
more... is with railways. Delhi enter hone ke liye kafi jyada traffic rehta hai , so time jyada lagta hai but exit karte time jaldi jaldi sab nikal jaate hain...