convert “DateInterval” to string for posetive times work employees

I want get total times of each person at company
for example
08:45
8:40
8:55
total n time
and I get this Error
Date Interval:: create From Date String (): Argument #1 ($datetime) must be of type string, Date Interval given
how can I solve it? Thanks 🙁

`
@if(is set($reports))

                              {{-- @if(is set($request->user id)) --}}
                               @php
                                   $time = 0;
                                    @endphp

                                       @foreach ($reports as $key => $report)

                                       <t r>
                                            <td scope="row">{{ $key + 1  }}</td>
                                               <td>{{ $report->user_ id->user_ name ?? 'خالی' }}</td>

                                                 <td>{{ $report->entry _ time ?? 'خالی' }}</td>
                                         <td>{{ $report->exit _ time ?? 'خالی' }}</td>
                                         <td>{{ $report->project->name ?? 'خالی' }}</td>
                                         <td>
                                         @php

                                            $enter = new Date Time($report->entry _time );
                                            $exit = new Date Time($report->exit_ time );
                                               $interval = $enter->diff($exit);


                                         Date Interval::create From Date String($interval);
                                        $time+=$i;
                                    @endphp

                                    {{ $interval->format("%H") . ':' . $interval->format("%i=") }}

                                    </td>
                                    <td></td>
                                    <td></td>
                                    <td>{{ $report->main _report ?? 'خالی' }}</td>
                                </t r>

                                    @endforeach
                                    {{ $time }}
                            {{-- @endif --}}
                            @endif
                            </t body>`