A two week turnaround is almost certainly a yes, so no worries there! Congrats!
The vignette sticker in your passport will have the valid from/to dates on it. On arrival, the only thing you have to do in any particular timeframe is collect your BRP and make sure it's all correct. Don't travel out of the UK before verifying your BRP is correct.
If you expect to be gone for very long, try to get your name on the bills and stuff before you leave. You will likely need to be present to do this, because when my husband tried to add me to utilities, the person on the phone wanted to speak to me directly to get my authorization. The sooner you do this, the more post you'll have to work with when it's time for FLR(M) in 2.5 years.