Is it when you choose a convoy mission, or when you click 'set off'?

I'm a weakling for now, but more than that my internet *s so bad that it doesn't matter if I have support or not, the fight is aborted as soon as it starts and I lose 15 coupons ;_; It might not seem like a lot, but it adds up over time. RIP coupons.

I've been trying to see if taking the convoy mission, and waiting for like 15 minutes before setting off works, but it doesn't seem to... This high level player who is like 30k power more than me has taken to plundering me and another player when we do SS missions.

I would wait until the end of the day, but I don't really want to risk not being able to get any good missions....