Passage: Almost immediately after the Lowestoft raid, Scheer began planning another foray into the North Sea. He had initially intended to launch the operation in mid-May, but the mine damage to Seydlitz had proved difficult to repair, and Scheer was unwilling to embark on a major raid without his battlecruiser forces at full strength. At noon on 28 May, the repairs to Seydlitz were finally completed, and the ship returned to the I Scouting Group.Derfflinger and the rest of Hipper's I Scouting Group battlecruisers lay anchored in the outer Jade roadstead on the night of 30 May 1916. The following morning, at 02:00 CET, the ships steamed out towards the Skagerrak at a speed of 16 knots (30 km/h; 18 mph). Derfflinger was the second ship in the line of five, ahead of Seydlitz, and to the rear of Lützow, the group flagship. The II Scouting Group, consisting of the light cruisers Frankfurt, Boedicker's flagship, Wiesbaden, Pillau, and Elbing, and 30 torpedo boats of the II, VI, and IX Flotillas, accompanied Hipper's battlecruisers.An hour and a half later, the High Seas Fleet left the Jade; the force was composed of 16 dreadnoughts. The High Seas Fleet was accompanied by the IV Scouting Group, composed of the light cruisers Stettin, München, Hamburg, Frauenlob, and Stuttgart, and 31 torpedo boats of the I, III, V, and VII Flotillas, led by the light cruiser Rostock. The six pre-dreadnoughts of the II Battle Squadron had departed from the Elbe roads at 02:45, and rendezvoused with the battle fleet at 05:00.

Question: when did he want to set up the initiative?
mid-May