I'm on Levemir, but also take split doses.
I think the most important part of the split is the fact that they are taken at 12 hour intervals. If taking them at 11am and 11pm, or mid-day and mid-night is better for your lifestyle, that may be possible. Ask the nurse to adjust the timings to suit your day better.
Having the morning one a couple of hours late may well cause problems with blood glucose readings across the day because there will be an overlap of insulin when you take your night-time dose and a gap before you take the late morning dose, causing lows at night and highs in the mid morning.