Would you take an acting supervisor role with no agreed end date?

Our visitor services supervisor is moving to another department. The museum manager asked whether I could “hold things together for a little while” while they decide what to do with the vacancy.

I’m a senior assistant, and I’d like to try supervising. The proposed work includes setting the weekend rota, handling complaints and checking in with six colleagues. I’d keep most of my reception shifts. There’s no change to my pay or title for now. The manager said we could review that once we know whether the arrangement works.

The chance appeals to me because I’ve never had responsibility for a whole team. Turning it down feels like declining the experience I’ve been asking for. But I also know that “a little while” could survive several busy months, and I’m uncomfortable being accountable for the rota if I can’t approve cover or change shift assignments.

I haven’t agreed yet. The departing supervisor has offered to spend an afternoon handing things over next week.

What would you need settled before accepting? Is a short trial worthwhile even without an immediate pay change, or does the lack of an end date make this too vague to take on?