You basically lose 5 seconds when first starting the bonus mission.

With a 5 girl 800 speed single squad I often get around 28 seconds left when I start 2nd run.

Out of 10 runs, I managed to do the 3-runs on the 20 FF 700 SD map 6 times. Out of 4 failed ones - 1 was first run when I lost a bunch of time to select the proper squad load and stuff, 2 were fucking errors that force-reloaded the game and 1 was when I run out of allies and lost to much time to "no" the "add to friends" stuff.

My advice is thou, to completely close and start again the browser, and set the quality to low - game is a lot faster, more responsive and loads faster on clean start. Somehow when game runs a long time it start to be sluggish and its a lot harder to get the 3 runs.

I fully cleared gacha from start to reset 6. At 7th reset I started to pay attention and tried to reset earlier, but ended doing it at 2/50 stuff left cause stuff I wanted wasn't spinning out (dragons). Now at 8/50 on 8th reset, cause stuff I want isn't sinning out, and at the same time I do think its fully clear-able before event end so I am fine with this.