Hi @wandimaru 
Steemit FAQ
Every 100% vote you cast will use 2% of your remaining voting power. Your voting power will recharge by 20% each day. You can vote more than 10 times per day, but each vote will be worth less, and it will take longer to reach full voting power again.
RE: Do you follow your Voting Power and how long does it take to charge up to 100%