You can simply review them early.

You won't have a ridiculous workload every 7 days.  Assuming that you pass all of the cards 7 days from now, they will be pushed out even further than 7 days, and with each review the gap will get larger and larger.  Anki also incorporates a degree of randomization to the scheduling, so that the intervals do not turn out exactly the same and create a large clump.

Just wait until the cards come back and review them.  250 in one day isn't a big deal.  After that first hurdle, the load should be lighter the next time you see them again.

If you think 250 is a huge workload : D be let me caution you that it could be more especially if you stop one or two days.
But if you want to scatter the cards for exemple at 8days /9days or so you can use the option reschedule :Action=>Reschedule but I won't advice you to do it every time as we are using Anki to let it do this for us not to interfere with its work.