I milk once a day... I am planning to bottle feed the kids this year so I will milk twice a day for a month and then go down to once. You do get more milk if you milk twice a day, but that really seems to be the difference from what I've read.
Your intake ( kid : table )
What you're feeding
We milk does anywhere from 2-6x a day while they're just fresh and while they're in their peak. Milking 4-6x a day takes but a few minutes anyway, why not. We also do this to keep does production at their best and prepare for shows.
You can also "wean" your does down to only once a day as well. Just start milking longer apart and slowly she'll drop enough in production to meet demand.
Does here with single or twins, I milk out multiple times a day to keep production up... after I know they are up to their capabilities I milk 2x a day until I begin to see a drop, usually at around 6 months fresh, then it's once a day until I dry them off for breeding season which most don't do but I like to give my girls a break from producing while they are growing kids