Long story but the L3 would start mining tomorrow.
If you have reasonably priced electricity, I would jump on that immediately but please don't do it if it will not signal SegWit. You'll suppress the price if SegWit doesn't get activated. Apparently L3 are very difficult to find right now.
But it depends, read below...
How long would ltc maintain that level ($30)
How long would it take. People have been saying ltc will pump since November
Look at the chart I made and my detailed reasoning and decide for yourself.
Personally I think if SegWit gets activated, then LTC will break $50 and probably hit $100. But it will be a very volatile rise, so I was using $30 as a conservative estimate of average price over the rest of the year.
But I really think it will be higher than that.
But nothing in life is guaranteed. Yet I think it is very difficult for you to lose money on that L3 in any case, although I can't compute precisely whether it is better to buy LTC or that L3. It depends on many factors such as the cost of your electricity, price assumptions, hashrate rise assumptions, etc..
I believe the supply ASICs is very constrained given the level of price rise we are possibly going to see. So owning a miner is a very leveraged position that can pay off big if some assumptions come true. But it can also end up a lower ROI than buying LTC. It is impossible to say for sure which is the better bet.
In either case, don't sell your LTC too cheap! (unless you believe SegWit activation will fail)