"Two per month would have been enough," Loew underlined.
The girls had irregular training time during last semester because of the COVID-19 pandemic.
Duris might have doubled Slovakia's lead, but Israel goalkeeper Ofir Marciano was equal to his effort, and also saved well from Robert Bozenik late in the game.
"There's no past Grand Slam champions left in the draw," said fifth seed Alexander Zverev from Germany, who made light work of Spain's Alejandro Davidovich 6-2, 6-2, 6-1 in another fourth round match.
Felix Bastians should have snapped Teda's winless run in the 85th minute but the German saw his penalty saved by goalkeeper Deng Xiaofei.
While club coaches, first of all, consider short-term success, Loew is speaking about his obligation to think in longer time-frames. Fan expectations might be similarly high.
"They feel that what is happening with the U.S. Government could create a negative precedent internationally that could be replicated and would jeopardize the entire global anti-doping system."
Briton Adam Yates retained the yellow jersey and kept a three-second lead over Jumbo's Primoz Roglic in the overall standings.
On October 12, Dragan Skocic's men will host Tajikistan in the Iranian capital Tehran.
But on September 4, the striker published a video message confirming that he would remain at the club for the 2020-21 season to see out the remaining year of his contract.
"His ability to see space, time his movements and read the game will really complement the qualities that we have in midfield and his arrival really strengthens the depth of talent we have in that position," Solskjaer told the club website.