It will depend on you.
Some people will put them on and wear them all day, right away.
Others will find that too stimulating.
Listen to your body and “be your own coach.”
Wear them for 20-30 minutes and see how you feel. If that felt good, add some more time.
If it ever feels like you “did too much,” then rest and do a bit less the next few times you wear them before you increase the amount of time you have them on (sadly, we never know we “did too much” until we, well, do too much 😉 ).