Start = stop times -- a question on duration and can duration be entered as floats

[ocolluphid]

Hi,
Can duration = 0 in the time-varying cox model? If not, are we allowed to pass a float (say 0.5) to split up the entries in long format? For example, let's say we have a time varying var (timevar) that changes from 10 to 11 between periods 0 and 1 (start_time = 0 and end_time = 1). The individual also dies at time period = 1. So if we apply the long format it would have t = 0 -> 1 for timevar = 10 and t = 1 -> 1 for timevar = 11. Could we modify that to t = 0 -> 0.5 for timevar = 10 and t = 0.5 -> 1 for timevar = 11 instead?
Thanks!