I just checked on the Ecobici app, for tourists, a 1-ride pass (up to 45 minutes) costs 2,100 ARS, and you can buy more than one per day. There’s also a 1-day pass for 15,000 ARS, which gives you unlimited trips of up to 90 minutes each in 24 hours. If you go over the time limit, you get a 5-minute grace period, and after that it’s 50 ARS per extra minute. Also, you need to wait 15 minutes before starting a new ride after ending one.