Import 10 Billion Rows, Daily
Look into BCP or BULK INSERT, both of which can share format files.

Quick math based on pure guesses, since no hard details are given:

13 numeric columns, pretend they're 6 bytes each on average = 13*6=78 bytes.

5 VARCHAR columns, pretend they're an average of 300 bytes each based on the "largest" being VARCHAR(1000) per the original question = 5*300 = 1500 bytes

1500 + 78 = 1578 bytes per row average.

1578*10000000000/(1024*1024) = 15048981 Megabytes per day

15048981/(24*60*60) = 174MB/s EACH WAY (once from the source and once to the database) if you load it continuously, 24 hours a day, rain or shine, during index maintenance, during backups, during DBCC CHECKDB and OS level disk defragmentation.

If you have 7 VARCHAR fields at an average of 800 bytes each, that's 40 times the bandwidth requirements of 5 VARCHAR fields at an average of 20 bytes each; the latter can be done over gigabit ethernet, the former cannot given your 10 billion rows a day, every day criteria.

Figure out what your data sizes actually are, and what your time windows actually are, and then do the math on how fast you need it to go for real.

If you have to, you can try disabling or removing triggers, traces, constraints, foreign keys, indexes, etc. on whatever table you're putting this data into.

And watch out for backup space requirements as well :).