Tour including Blue Lagoon

If you are including the BL in a tour, yes you will be limited by the time spent there. We have done BL twice and spent right about 2 hours total there, FWIW. If you do the BL on your own vs a tour, you can spend as long as you want there.

I recently did a Golden Circle tour that ended at the Sky Lagoon. Though the time was meant to be 2 hours there, you could have easily planned to stay longer and just take a taxi back to your hotel as the location is still in the city. Personally, found the 2 hours to be sufficient, and this included the 7 step ritual. The eternity pool there looks over the ocean and the sauna has an enormous plate glass window that also looks over the ocean.
A different experience to the Blue Lagoon perhaps, but since your time is short, this might be a better place? I only had 2 days too. Chose smaller bus tours, 19 to a bus. South Shore 1 day, Golden Circle the next with a visit to that cool tomato farm for lunch. Well worth it.

We chose two other pools for our longer stay. I think you may be over-rating the wedding-spa ambience of this huge, money-printing place. We went to look, but did not have time to bathe. It's like selfie/celebrity/wade-up bar heaven, and sometimes crowded. Two hours are more than enough.

We did an 11 hour tour a few weeks ago with Nice Travel. It included the Golden Circle, Kerid Volcano, and Blue Lagoon. We really enjoyed the day and would recommend it. The tour ended with 2 hours at the Blue Lagoon. It was our first time there and it was fun. It was not crowded at 5 pm. Could have used maybe another 30 minutes there but overall a very nice experience.

Tim--I am not sure how you can really say that since you did not go in and experience it yourself. Yes there are other wonderful lagoons around the country, but the BL is quite nice IMO and nothing like what you describe. You have posted negative comments about this several times, which I don't think is fair since you have no first hand experience. Just my opinion of course.

I disclosed, explicitly, that we only looked. Fifteen minutes of viewing, including through the directly adjacent windows, entitles me to an opinion.

It is equally unfair to suggest that I am operating an anti-BL campaign.

Tim--I never said you were "operating an anti-BL campaign". What you can see from the window is only part of it.

Please stick to my original question. I really don't want to read through negative banters back and forth. I was hoping someone knew of an excursion that included the Blue Lagoon that wasn't 11 hours long. Or, how can I spend possibly 2 1/2 - 3 hours at the Blue Lagoon. I have made my decision to go there. Thanks for the help!

My apologies for suggesting a different lagoon.

bltoyzan,
I think that many Iceland visitors who have limited time, such as yourself, do well to plan the Blue Lagoon either on the way out of, or back to the airport. Because it's so close to the airport, and a good 45 minutes from Reykjavik, doing it that way will end up buying you time to do other things. You don't say where you're flying to and from, but here's my example; I live on the east coast of the US. On departure day, I take an early Flybus from Reykjavik, which lands me at the Blue Lagoon around 9am. My flight won't leave until 3pm or later, so I can generally be in and around the Lagoon until at least 12pm, possibly later, depending on flight times. I'm the person who would spend 3 hours straight in the water, so, I get your not wanting to be shortchanged on time. Hope this helps.