: Does longer oil pulling than recommended 20 minutes bring any benefits? EDIT. I am looking for references to serious research articles on the subject, whether confirming or refuting. (Or articles referring to such, but not

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The study you linked in the comments (Amith et al., 2007) stated that there were 10 subjects and the subjects were to

Swish approximately 8-10 minutes or till you feel a fullness in your mouth.

The last part of the instructions to the subjects suggests that the feeling of fullness in the mouth could happen before the 8 minute point. Plus the study of 10 subjects is a very small study. Nevertheless, the study points out that there is a potential that oil pulling can help with oral hygiene.
The point that the study makes is that 10 minutes is enough to obtain any benefit from oil pulling. Whether or not you choose to pull for more time is up to you.
As pointed out in the comments, the dentistry website you linked indicates that:

There is no official verdict regarding the benefits of oil pulling as there is unfortunately very little research on the topic.

Once there are more (and larger) studies performed, there will be more of a consensus on the subject, therefore creating an official stance on the benefits of oil pulling.
If you feel that oil pulling helps, there is an indication that 8-10 minutes is enough. If you wish to follow the 15-20 minute suggestion you have seen (or longer) then fine. That is your choice.
What I would suggest is to speak to your dentist/orthodontist and seek their advice. Their advice will be tailored to your specific needs.
References
Amith, H. V., Ankola, A. V., & Nagesh, L. (2007). Effect of oil pulling on plaque and gingivitis. J Oral Health Community Dent, 1(1), 12-18. Retrieved from www.johcd.org/doi/pdf/10.5005/johcd-1-1-12

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Is oil pulling beneficial for oral health?

It may not be possible to make convincing conclusions from three small studies (linked in the question) about the benefits of oil pulling on oral health, especially when knowing this is an Ayurvedic dental technique and most authors involved in the studies are Indians, so they might be biased for positive results.

A systematic review is usually considered a higher level evidence.

The authors of the following review from the University of Oxford/UK Effect of oil pulling in promoting oro dental hygiene: A systematic review of randomized clinical trials (PubMed, 2016) have concluded:

The limited evidence to date from clinical trials suggests that oil
pulling may have beneficial effects on oro dental hygiene as seen
for the short period of time investigated.

This systematic review included 26 randomized clinical trials, which were short term (10-45 days) and included only 160 participants in total, they "varied in reporting quality," and in 5 studies no effect was observed, which, altogether, is not a very strong evidence.

The authors (mainly from Pakistan and Saudi Arabia) of the following review Oil pulling and importance of traditional medicine in oral health maintenance (PubMed, 2017) have concluded:

For modern day practices, oil pulling can be suggested for adjunct
use, with tooth brushing and flossing, to maintain the standard oral
health care.

According to American Dental Association:

Currently, there are no reliable scientific studies to show that oil
pulling reduces cavities, whitens teeth or improves oral health and
well-being. Based on the lack of scientific evidence, the American
Dental Association does not recommend oil pulling as a dental hygiene
practice.

Are there any benefits of oil pulling for more than 20 minutes?

I have found no studies that would test this.