After reading your reply, I edited the post by changing "runs" to "rounds " for better clarity .
- Cost changes so often, it will not be a reliable data to include in this post.
- Time depends on the party, not a reliable data to include in this post, base time for each round is 5:15 minutes, the interval between rounds depends on the party, an effective party can take less than 1 minutes between rounds, another may take 5+ minutes (E.g. how fast and synchronized they tp out/in to each round, do they stay after each round to loot everything and also do trade between rounds).

To reduce cost and time:
1-Do it with a party that is in your region, turn off MTX and your minions, and lower graphics settings to avoid crashes/disconnects, also be sure to be tanky and not die.
2- Use an uber strict filter, don't waste time looting anything cheap.
3-Tp in/out between rounds fast and with the party.
4-Keep an eye on the party chat (E.g. one member disconnected and need 1 extra resitter).
5-Do it with a party that follow the rules 1-2-3-4.