There were three rain delays in total over the course of the match, which lasted four hours and 13 minutes as Thiem overcame the world No 1 6-2, 3-6, 7-5, 5-7, 7-5.
Thiem will have been relieved to have finally ended the match when he did having been in action the previous two days, beating Russian Karen Khachanov before the first few hours of his clash with Djokovic, at which time he led 6-2, 3-6, 3-1 before it was postponed.
The Austrian, ranked fourth in the world, is now in his second successive Roland Garros final against Nadal.
Taking on the 11-time French Open champion on Court Philippe-Chatrier is one of the toughest tests in men’s tennis, particularly given Thiem’s work-load over recent days.
But with the 25-year-old one of the fittest players on the ATP Tour, he says the chance to win his first Grand Slam title will help carry him avoid any tiredness.
“I’m feeling fine. I’m full of adrenaline, of course, still from today’s match, and also I will have that tomorrow,” Thiem said in preview of the final against Nadal.
“So I’m not going to be tired. It’s all going to come after the tournament.
“So I’m ready to leave all or everything what I have out on the court tomorrow.”
Nadal has never lost any of his previous 11 finals at the French Open and is 91-2 overall in Paris.
But Thiem – who has beaten Nadal four times, all on the Spaniard’s favoured clay surface – insists his mentality is that he approaches the match with the utmost belief he can pull off an upset while ensuring he does not expect too much from himself.
“I think it’s really important that I go into the match with the belief to win,” he said.
“Of course it’s a big dream for me to win that match tomorrow, to win this title.
“But I also have it in my head that if it does not happen tomorrow – which can happen easily because of the opponent on the other side of the net – I don’t make myself too much pressure.”
Nadal, meanwhile, admits he is wary of how tough a match it will be despite his history at the second Grand Slam of the year.
“In a final like this one, the opponent is always at a very high level, but that’s the rule of sports. That’s why this sport is even more interesting,” he said.
“I think that I’m confident in myself. If I’m not able to execute my game plan, it’s going to be complicated.
“But if I play well, and I have played well up to now, I’ve got all my chances. But it’s always a match and anything can happen.
“Being in the final of Roland Garros again means a lot and especially coming back from a tough situation with all the injuries that I had.
“Being able to recover the level that I had the past couple of weeks is something that I am very proud of. I’m just focused on keeping going and doing my thing well.”