First off, you won't HAVE the miner for months unless you buy a used one from someone, or a "July Batch" from a reseller.

Second off, even if you have it in hand by end of September, that still only leaves you about 4.5 months of mining time out of your "6 months" - AND difficulty is going to climb quite a bit as folks finish getting their July batch miners online and then again when folks get the September batch miners and get THOSE online.

 Latency shouldn't be a significant factor, my A2 Scrypt mining farm was only seeing about 1% higher stales when I was running it via a SAT connection at 650-750 ms lag.



 On the plus side for you right now - the only other folks shipping Scrypt miners is Innosilicon with the A4, and those are quite a bit lower efficiency and less than 60% of the hashrate of the L3+ so they seem to be selling slower and not affecting total hashrate nearly as much - and THOSE are also sold out 'till September.