OK thanks for that info. That's very helpful. With that kind of bather load I think the Dichlor-then-bleach method will work best for you, especially since you don't have an ozonator and you are using the tub frequently enough to be able to add chlorine after each soak and have it last through to the next soak. You can always try bromine at some point perhaps during the latter part of your water change cycle (i.e. a week or two before you need to change the water) to see if you like it better, but generally chlorine does a better job of keeping the water clear, getting rid of bather waste, and having a less objectionable smell if used properly.
In Jeff's first response to your post in this thread he linked to the instructions for the Dichlor-then-bleach method. Why don't you take a look at it and ask questions if you have any.
If you were to use only Dichlor in the spa, then it would build up Cyanuric Acid (CYA) and you would likely have to change the water after the standard Water Replacement Interval (WRI) which is (1/9) x (Spa Size in Gallons) / (# of Person-Hours Per Day) = (1/9) x (260 gallons) / ((2.5 days per week)/(7 days/week) * (2 people) * (40 minutes)/(60 min/day))) = 61 days so around 2 months, but with the Dichlor-then-bleach method you will likely be able to go twice as long between water changes and the water will be in better shape even at the end of that 4 month interval. Note that you have a smaller spa so the bather load is relatively high, though 4 months isn't so bad for changing the water.
If this is a new spa, then I'd recommend you getting
Ahh-Some and use it just before changing the water, even if you do this with an initial water fill and water replacement. It will clean out any greases, oils, or biofilm that may be in a new spa. If you do not do this, then you should not expect to go as long as indicated above before your first water change.