I would divide the 100k into five lots of 20k. Each lot would dedicated to a specific currency (if it were me, the primary four would be: BTC, ETH, LTC and XRM). Each lot would be broken down into 20 x 1000 openings. Meaning across the latter, I'd have 80 openings made over several months, though it would really depend what the market was doing. The remaining 20k would be used to pick up alt coins as the opportunity arose.
I'd hold 90% of it for at least six months. Though 18 would probably be better.