In Jain time‑cycle (kālchakra), your question “How far away is 3rd era of Utsarpini?” means:

• Right now, in Bhārat Kṣetra (our world-region), we are in the 5th era (Duṣamā / Dukhama) of the Avasarpini half‑cycle (descending time). ( jainknowledge.com)
• After this will come the 6th era of Avasarpini, also 21,000 years long and even more miserable. ( jainknowledge.com)
• Only after the 6th era ends, a new Utsarpini half‑cycle starts, beginning with its 1st, then 2nd, and then 3rd era of Utsarpini. ( jainknowledge.com)

Can we give an exact number of years?

No. In Jain cosmology:

• The 5th and 6th eras are each 21,000 years long (in Bhārat Kṣetra). ( jainknowledge.com)
• But the 1st and 2nd eras of Utsarpini (and also some of Avasarpini) are of “asankhyāta” / “sāgaropama” duration – astronomically huge, practically countless. Their lengths are symbolic and beyond normal counting. ( jainknowledge.com)

So:

1. First we must finish:

- Remaining part of current 5th era - Whole 6th era of Avasarpini

1. Then the entire 1st era of Utsarpini (countless years)
2. Then the entire 2nd era of Utsarpini (again countless)
3. Only after all that does the 3rd era of Utsarpini begin.

Because those first two Utsarpini eras are of inconceivably long length, Jain texts make it clear: The 3rd era of Utsarpini is unimaginably far in the future – not something that can be put in normal years like “after X million years.”

If you’d like a simple overview of Utsarpini, Avasarpini and their six eras, you can read more here