The miners work on an algorithm that is akin to a random lottery. Depending on how much "mining power" you have comparative to all other miners staked, it could take quite a while to get a payout. I think that you have a very low mining power with only 1 PALM. You should earn something but it may take a long time to see the payout come in as you need to wait until your "lucky" enough to get the return.

To give some context, I have a few PALMM and they pay a few PAL tokens each day. It's because the mining power on those (I believe) is 4x the mining power on 1 PALM which means I have over 16x the mining power that you've got. When you do get your first payout, I think it will be quite large in relation to your total investment -- don't quote me on it though.

Keep me posted with how it develops. I'm curious to see if/when/how much you get paid with 1 PALM.