If statement to multiply rates against time taken

I am trying to use a formula to calculate call out charges to site for a security company used

I would like to use an if statement to calculate the cost of the call out.

I have a time onsite column (L) and if security have spent an hour of less on site then I want to set a rate of £45.82 for that call out.

If the time spent on site is over an hour then I need to multiply the total time on site by £45.82, so for example if on site for an three hours and 45 minute the total call out charge would be £171.83, but my formula is giving me £45.82 no matter what appears in column L

The formula I am using is =IF(L3<""&TIME(1,0,0),$S$2,L3*24*$S$2)

Please help as I cant work it out