Brazil and the United Arab Emirates are the final two races of the season, the latter coming on November 25, eight months after the curtain-raiser in Melbourne.
The early signs look promising, after Valtteri Bottas led Hamilton home by just 0.003 seconds in Free Practice 2, while Sebastian Vettel was within a tenth of the Finn's benchmark, suggesting we may have a closely-fought battle ahead of us on Sunday.
Despite next year also featuring 21 races, the schedule in 2019 means the F1 calendar will run into December for the first time in over 50 years.
Now, with the announcement of a Vietnamese Grand Prix being added to the calendar from 2020, Lewis Hamilton has expressed his concern that the season is becoming unbearably long.
"Vettel and Ferrari lost an opportunity this year, but I think Sebastian is more guilty than the team", said the Brazilian, speaking on Globo's Bem, Amigos!
"I am someone that really loves racing, but the season is long, it takes a big commitment from all of us, and it is a long time away from our families".
'The seasons are getting longer, and the off-time is getting shorter, so from a competitor's point of view the turnaround is short. "I want to win by doing it by myself".
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"You start preparing for next year as soon as the season is done, so getting your mind tuned is very hard". Getting your mind turned.
He said, however, that it was still tough to find time to switch off and recover.
Kimi Raikkonen congratulated Lewis Hamilton on his fifth world title, but warned him that Ferrari are going all out to stop Mercedes completing a Formula One championship double at this weekend's Brazilian Grand Prix. "Even though we had the base performance to do better", said Mercedes team chief Toto Wolff. "We still have problems that we are trying to work through and understand".
On Wednesday Formula One confirmed a new grand prix in Hanoi, which will be a street race. "Whoever has the most points has won it. He won it. Fair play and congratulations to him".
Mercedes can join Ferrari in becoming just the second team in F1 history to win a fifth constructors' championship in a row.
"There's a drivers' championship, but if you go to any team they're probably going to say this is more important for them - the constructors' championship more than the drivers".
Hamilton is hoping he can bounce back to competitiveness this weekend, after two races in which Mercedes have struggled for pace.