Student or Learner
1. I'm still have a time to rest.
2. I still have a time to rest.
3. I have still a time to rest.
Can we say 'a time'?
There are situations in which you can say "a time."
However, when you mean "I am available" or "I have a period of time in which to accomplish something," then use "I have time" without the "a."