OHLC data 3m and 5m time frames - Intra day candle data

Developer API
1

I am accessing the OHLC data 3m and 5m time frames using Intraday Candle Data V3 | Upstox Developer API . Have following questions.

  1. say 09:15:00, 3m candle appears at what time on upstox server ? – After how many secs ?
  2. I am trying to get 500+ symbols of nifty 500 index. That is 500 calls per 3m. What are the rate limits that apply here ?
  3. If upstox python sdk could provide this (tick data to candle conversion for say all nifty 50 stocks), it will be highly helpful.

Thanks for your quick attention.